This question is incomplete because the options are missing; here are the options:
Which statement describes what Levi did to prepare the control group in his experiment?
A) Levi held all experimental factors constant except for fertilizer.
B) Levi did not apply any fertilizer to one of his plants.
C) Levi applied different amounts of fertilizer to three of his plants.
D) Levi measured his plants on five separate days.
The answer to this question is B. Levi did not apply any fertilizer to one of his plants.
Explanation:
In an experiment, the control group refers to the subject or subjects, in this case, the plants, that do not receive the treatment or variable tested by the researcher. This implies the control group for Levi is the plant with no fertilizer because this is the only plant that does not receive the treatment or fertilizer. Moreover, this acts as a control group because Levi can use this plant to determine if the growth of the other three plants is positively or negatively affected by the use of the fertilizer.
100 POINTS!!! ANSWER ASAP!! Research a scientific belief that was accepted centuries ago, but has since been
disproved. How does it support the use of the term "scientific theory" instead of
"scientific fact?"
Answer:
A scientific theory is an explanation of an aspect of the natural world that can be repeatedly tested and verified in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results. Where possible, theories are tested under controlled conditions in an experiment.[1][2] In circumstances not amenable to experimental testing, theories are evaluated through principles of abductive reasoning. Established scientific theories have withstood rigorous scrutiny and embody scientific knowledge.[3]
The meaning of the term scientific theory (often contracted to theory for brevity) as used in the disciplines of science is significantly different from the common vernacular usage of theory.[4][note 1] In everyday speech, theory can imply an explanation that represents an unsubstantiated and speculative guess,[4] whereas in science it describes an explanation that has been tested and widely accepted as valid. These different usages are comparable to the opposing usages of prediction in science versus common speech, where it denotes a mere hope.
The strength of a scientific theory is related to the diversity of phenomena it can explain and its simplicity. As additional scientific evidence is gathered, a scientific theory may be modified and ultimately rejected if it cannot be made to fit the new findings; in such circumstances, a more accurate theory is then required. That does not mean that all theories can be fundamentally changed (for example, well established foundational scientific theories such as evolution, heliocentric theory, cell theory, theory of plate tectonics, germ theory of disease, etc.). In certain cases, the less-accurate unmodified scientific theory can still be treated as a theory if it is useful (due to its sheer simplicity) as an approximation under specific conditions. A case in point is Newton's laws of motion, which can serve as an approximation to special relativity at velocities that are small relative to the speed of light.
Scientific theories are testable and make falsifiable predictions.[5] They describe the causes of a particular natural phenomenon and are used to explain and predict aspects of the physical universe or specific areas of inquiry (for example, electricity, chemistry, and astronomy). Scientists use theories to further scientific knowledge, as well as to facilitate advances in technology or medicine.
As with other forms of scientific knowledge, scientific theories are both deductive and inductive,[6] aiming for predictive and explanatory power.
The paleontologist Stephen Jay Gould wrote that "...facts and theories are different things, not rungs in a hierarchy of increasing certainty. Facts are the world's data. Theories are structures of ideas that explain and interpret facts."[7]
Explanation:
Answer: Answer: In the past was believed that species were fixed entities Explanation: Before Darwin's evolutionary theory (in which all living things arise through descendant…
Explanation:
Find the median for this set of data: 23 24 28 26 23 29
A25.5
B23
C25
D26
Answer:
C)25
Explanation:
Put the numbers from smallest to largest.
23 23 24 26 28 29
Find the one in the middle in this case their is 2 in the middle so add them then divide them by 2
24+26=50
50/2=25
Which sentence describes an example of sublimation? A. Dew forms on leaves on a cold morning
Answer:
Dry ice changes to carbon dioxide when kept in an open container.
why is the other object acquired more kinetic energy?
Answer:
Anytime matter is in motion it has kinetic energy.The faster an object moves, the more kinetic energy it has. The more mass an object has, the more kinetic energy it has.
Which type of molecule that can be found in living things lacks carbon atoms?
O protein
O carbohydrate
O fat
O water
Can someone get me Pokémon go hacked for IOS without human verification?
add: 6 2/8 + 1 1/3
please help me
You have been instructed by the supervisor of your research laboratory to increase the osmotic pressure of a solution. Select all below that would (or you could use to) increase the osmotic pressure of a solution. Question 8 options:
a. decrease the amount of water in the solution causing a higher concentration of nonpenetrating (nonpermeable) solute.
b. adding more of a penetrating (permeable) solute to the solution.
c. adding more of a nonpenetrating (nonpermeable) solute to the solution.
d. adding more water to the solution E) increasing the osmolarity of the solution but not increasing the amount of nonpenetrating (nonpermeable) solute.
Answer:
The correct answer is - option A and Option C.
Explanation:
Osmotic pressure is the minimum force or pressure that is required to stop or prevent the water movement from diffusing through the semipermeable membrane by osmosis.
The osmotic pressure of the solution or water would be increase if the concentration of the water or solution would be increase by adding more solute.
Thus, the correct answer would be - a AND c
Familial Down syndrome is similar to primary Down syndrome in that it is caused by trisomy 21. However, in familial Down syndrome, all or part of the third copy of chromosome 21 has translocated onto another autosome, typically chromosome 14. In cases of familial Down syndrome, one of the parents of the affected child is often a carrier of a translocated chromosome. The translocation carrier parent does not have Down syndrome because he or she has a total of two copies of chromosome 21.Suppose that a woman is a translocation carrier of chromosome 21 on chromosome 14. She conceives six zygotes with a normal man who carries no aneuploidies. Match the description of the chromosomes inherited by each zygote with the viability of the zygote.
Viable Normal or Translocation carrier,there are;
- Two normal copies of 14 and two normal copies of 21.
- One normal copy of 14 and one normal copy of 21, then one 14 to 21 translocation.
Then viable with down syndrome will include:
- One 21 to 14 Translocation, two normal copies of 21 and one normal copy of 14.
Then the VIABLE with down syndrome will be:
- One normal copy of 14 with two normal copies of 21
- Two normal copies of 14 with one normal copy of 21
- One 21 to 14 Translocation,a normal copy of 21,then two normal copies of 14.
Signal transduction pathways lead to a cellular response. Which of the potential cellular responses is most likely to occur in response to cortisol?
PLEASE I NEED ANSWERS
Answer:
A. territory consumers
Shelly wants to find the speed that her dog can run. What should Shelly do?
measure the distance the dog runs
measure the time the dog runs
measure the size of the dog and the distance it runs
measure the time it takes for the dog to run a certain distance
Answer:
measure the time it takes for a dog to run a certain distance
Why did the color of the bromthymol blue change in the carbon transfer through snails and elodea experiment
The Frontline Child Care Portal has information pages for which groups?
Employers, schools, doctors, and state agencies
Parents, employers, schools, and child care providers
Schools, child care providers, doctors, and state agencies
Parents. doctors, employers, and schools
State agencies only
Answer: Parents, employers, schools, and child care providers
Explanation:
The Frontline Child Care Portal was created to help alleviate the burden of childcare from frontline employees such as doctors, nurses and grocery store owners as they work during this very trying pandemic season.
The portal connects parents who are essential workers, Employers with employees in need of child care services and schools and child care providers who are licensed and can offer their services to the parents in need.
Inez has two beakers that contain ethanol. One beaker contains 150 mL of liquid. The other beaker contains 300 mL of liquid. What can Inez expect to observe when she compares the properties of the liquid in the beakers.
The correct answer is B. The melting point of the liquid in each beaker is the same.
Since both beakers contain ethanol, Inez can expect the liquids in the beakers to have the same chemical properties, such as the molecular structure, boiling point, and density that are present in option A.
What is ethanol?If Inez adds a small object (like a grape or a paper clip) to each beaker, she may observe that the object sinks faster in the beaker with the smaller volume of liquid as there is less liquid to displace, and many factors like density and surface area play an important role in this, as the liquid in the larger beaker will be more massive and may feel heavier than the liquid in the smaller beaker, and if Inez were to leave both beakers out in the open air, the ethanol in both beakers would eventually evaporate, but at different rates.
Hence, Inez can expect the liquids in the beakers to have the same chemical properties, such as the molecular structure, boiling point, and density, that are present in option A.
Learn more about ethanol here.
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question is incomplete, complete question is below
Inez has two beakers that contain ethanol. One beaker contains 150 mL of liquid. The other beaker contains 300 mL of liquid. What can Inez expect to observe when she compares the properties of the liquid in the beakers.
A)to have the same chemical properties, such as the molecular structure, boiling point, and density
B)to have the different chemical properties, such as the molecular structure, boiling point, and density
Which of the following correctly describes the differences in organelles found in plant cells compared to animal cells.
A. Chloroplasts and Endoplasmic Reticulum are found only in plant cells and the nucleus is only in animal cells.
B. Cell membranes and mitochondria are found only in plants. Ribosomes are much larger in plant cells.
C. Cell walls and chloroplasts are found only in plants. Vacuoles are much larger in plant cells.
D. Mitochondria are found in animal cells and chloroplasts are found in plant cells.
Answer:
C. Cell walls and chloroplasts are found only in plants. Vacuoles are much larger in plant cells.
Juan and his science class are constructing models of sugar crystals. He wants his model to show how the sugar molecules move in the crystal. He is using plastic foam balls to represent the sugar molecules. How should he put the plastic foam balls together to make his model? O A. Connect them with stiff springs B. Fill a clear cube with them O C. Glue them together D. Place a few of them in a plastic bag
Answer:
The correct answer is option B. "Fill a clear cube with them".
Explanation:
Sugar crystals, colloquially known as "rock candy", are conglomerates of sugar molecules that are formed when sugar-saturated water are cooled. Sugar crystals are arranged in a three dimensional repeating pattern, forming a cube like structure. Therefore, Juan could fill a clear cube with its plastic foam balls to represent sugar crystals. I attached an image of sugar crystals dissolving in water as reference.
Answer:
The correct answer B: Fill a clear cube with them.
Explanation:
It so many people produce the chemical, why doesn't everyone smell it? Explain ideas.
Answer:
I really don't know.. here are my guesses though.
Explanation:
I think that maybe carbon dioxide is either:
a) A chemical that has no smell.
or
b) We are so used to the smell of it that we don't even smell it anymore. Like how you cant smell your own scent kind of.
Atherosclerosis is a disease that obstructs blood flow and, therefore, oxygen supply to target organs. A major component of atherosclerosis is the excessive reproduction of smooth muscle cells of the blood vessels. Certain drugs may have the potential to reverse or prevent the unregulated reproduction of the diseased blood-vessel cells. Which of these processes is the most likely target of these drugs?
Answer:
cell division
Explanation:
The process most likely taken by the drugs is cell division, as it will help reverse or protect against disease This is further explained below.
What is Atherosclerosis?Atherosclerosis is a condition in which fatty material deposits on the inner walls of the arteries.
In conclusion, for the condition, these drugs target cell division as an effective means to potentially reverse or prevent the unregulated reproduction of diseased blood-vessel cells.
Read more about Cell
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Which of the following is one way that animal species survive?
photosynthesis
rigid cells
chlorophyll
reproduction
Answer:
4) reproduction
hope it will help you
Answer:
the answer is the last one reproduction
Explanation:
A fusion protein can be sythesized to carry a specific tag, which is useful in identifying the proteins in various experiments. Fusion proteins with the FLAG epitope bind to specific anti-FLAG antibodies and carry this extra sequence:
Asp-Tyr-Lys-Asp-Asp-Asp-Asp-Lys
At a pH of 7.0 the amino acids that would be charged in FLAG are:______.
A. Tyr.
B. Lys.
C. Asp.
D. Glu.
Answer:
B and C
Explanation:
At a pH level of 7, aspartic acid has a net charge that is of -1, that is it is negatively charged.
While lysine has a net charge of +1 at this same pH level of 7
Tyrosine on the other had has zero net charge at this pH. And glutamine itself is absent.
Therefore the amino acids that are going to be charged are :-
b. Lys
c. Asp
Why we should care for producers? Write any four reasons .
Answer:
Explanation:
1) provide energy
2) provide oxygen
3) food chain
4)maintain carbon dioxide - oxygen balance in air.
Earth is a closed system. true or false
that is true.!
the earth is a closed system
Earth is a closed system, therefore, it's true.
A closed system simply means a system where only energy is transferred in the surroundings. On the other hand, an open system is one where matter and energy can be transferred.
It should be noted that Earth is a closed system due to the fact that only energy can be naturally transfered in the atmosphere. In this case, it's neither gaining matter nor losing it.
Therefore, the statement is true.
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Ions are
Atoms with more neutrons than protons
Atoms with a positive or negative charge
Atoms with no charge
Atoms with more protons than neutrons
Atoms that are joined together in fixed proportions
Answer:
Ions are atoms with a positive or negative charge.
Explanation:
Ions are atoms or molecules that, when subjected to the phenomenon of ionization, gain or lose electrons, ceasing to be neutral and acquiring an electric charge.
The charge that atoms or molecules possess can be positive —if it has lost electrons— or negative when it acquires electrons. The negatively charged particle is called anion, and when it is positively charged cation.
The other options are not correct because of:
There are usually as many or more neutrons than protons. Uncharged atoms are neutral. The number of protons or neutrons does not affect the electric charge of the atom.Atoms that joined in fixed proportions can form molecules.THIS ORGANELLE IS A VERY IMPORTANT FACTOR FOR MITOSIS AND MEIOSIS
Answer:
One of the characteristics of living things is the ability to replicate and pass on genetic information to the next generation. Cell division in individual bacteria and archaea
usually occurs by binary fission. Mitochondria and chloroplasts also replicate by binary fission, which is evidence of the evolutionary relationship between these organelles and prokaryotes.
Cell division in eukaryotes is more complex. It requires the cell to manage a complicated process of duplicating the nucleus, other organelles, and multiple
chromosomes. This process, called the cell cycle, is divided into three parts: interphase, mitosis, and cytokinesis. Interphase is separated into three functionally
distinct stages. In the first growth phase, the cells grows and prepares to duplicate its DNA. In synthesis, the chromosomes are replicated. The cell prepares to divide. In mitosis, the duplicated chromosomes are separated into two nuclei. In most cases, mitosis is followed by cytokinesis, when the cytoplasm divides and organelles separate into daughter cells. This type of cell division is asexual and important for growth, renewal, and repair of
multicellular organisms.
Cell division is tightly controlled by complexes made of several specific proteins. These complexes contain enzymes called cyclin-dependent kinases (CDKs), which turn on
or off the various processes that take place in cell division. CDK partners with a family of proteins called cyclins. One such complex is mitosis-promoting factor (MPF),
sometimes called maturation-promoting factor, which contains cyclin A or B and cyclin-dependent kinase (CDK). CDK is activated when it is bound to
cyclin, interacting with various other proteins that, in this case, allow the cell to proceed from G2 into mitosis. The levels of cyclin change during the cell cycle. In
most cases, cytokinesis follows mitosis.
Explanation:
How would you make 150 ml of a 100microg/ml X-gal solution using the 20mg/ml stock?
Answer:
Explanation:
5
what is the indepent variable, dependent variable, and constants of the cell transport lab? here is the procedure: Procedure: 1. Before beginning the experiment, record at least two observations of the raw egg in your lab report. 2. Wrap the string around the center of the egg to determine its initial circumference. Measure the string and record the initial circumference in centimeters (cm). 3. Gently wrap the egg in the jar and completely cover the egg with vinegar. Use the lid to seal the jar and note the time. This will be considered the "start time" of the experiment. 4. After approximately 24 hours from the start time, carefully remove the egg from the jar of vinegar. If the shell has completely dissolved, exposing the inner membrane, move on to the next step. If not, return the egg to the vinegar until the shell has completely dissolved. 5. Record at least two observations of the egg. 6. Measure and record the circumference of the egg, being sure to measure it in the same way
Complete experiment:
Before beginning the experiment, record at least two observations of the raw egg in your lab report. Wrap the string around the center of the egg to determine its initial circumference. Measure the string and record the initial circumference in centimeters (cm). Gently place the egg in the jar and completely cover the egg with vinegar. Use the lid to seal the jar and note the time. This will be considered the "start time" of the experiment. After approximately 24 hours from the start time, carefully remove the egg from the jar of vinegar. If the shell has completely dissolved, exposing the inner membrane, move on to the next step. If not, return the egg to the vinegar until the shell has completely dissolved. Record at least two observations of the egg. Measure and record the circumference of the egg, being sure to measure it in the same way every time you measure circumference. Pour out the vinegar and rinse the jar. Then fill the jar about half full of tap water. Gently place the egg back into the jar, making sure it is completely covered with water. Use the lid to seal the jar. After a total of 48 hours from the start time, carefully remove the egg from the jar of water. Make two observations of the raw egg, and measure and record the circumference. Gently place the egg back into the jar, making sure it is completely covered with water. Use the lid to seal the jar. After a total of 72 hours from the start time, carefully remove the egg from the jar of water. Make two observations of the raw egg, and measure and record the circumference. Describe the results of your experiment or study. Use graphs and charts where appropriate.Answer and Explanation:
During an investigation, a researcher can study, under controlled conditions, how one of the variables influences the other one. The independent variable can be manipulated by the researcher, while the dependent one can not. The independent variable can show different values that do not depend on another variable. Instead, they directly affect the values of the dependents ones. A hypothesis is a claim of how this relationship works.
The independent and the dependent variables are the two principal factors needed in an experiment.
Independent variable / Manipulated variable: Refers to all the variables in an experiment that provoke a response in another variable. This variable is modified during the experiment to analyze how another variable responds to it. The researcher wants to study how the changes in these variables affect the dependent variable. The researcher can change these variables to see what changes it implies in an object, process, trait, or anything that depends on them. Usually, the independent variable is represented by the X letter. In the exposed example, the researcher manipulates the time that the egg is submerged in water. Time spent in the water is the independent variableDependent variable / Responding variable: Its response depends on any change in the independent variable. The dependent variable is the one that is being investigated, studied, and measured. It represents a quantity of something which value depends on how the independent variable is modified. It is usually identified by the letter Y. A change in the dependent variable might be proportional or inversely proportional to the change in the manipulated variable. In the exposed example, the dependent variable is the egg circumference.The egg gets bigger changing its circumference as it spends more time submerged in water. The longer time it is submerged, the bigger it gets.
Constants / Controlled variables: Refers to those variables in an experiment that are controlled and have no influence on the results. These variables do not affect the change in the dependent variable values. In the exposed example the use of the lid to seal the jar and the amount and concentration of vinegar might be considered as a controlled variable. These elements are used but do not provoke any change in the size of the egg.Answer:
• Independent Variable: time the egg spends in the water.
• Dependent Variable: The egg circumference
• Controlled Variable: Quantity of vinegar.
Explanation:
Who is air warmer near earths surface
What is an atomic theory
Answer:
the theory that all matter is made up of tiny indivisible particles (atoms). According to the modern version, the atoms of each element are effectively identical, but differ from those of other elements, and unite to form compounds in fixed proportions.
Explanation:
Hope this helps:)
The direction and speed of an object is described by its