Answer:
D
Explanation:
Oxygen has 6 valence electrons and it is in group 16 on the periodic table
Answer:
D.
Explanation:
I took the test.
What is an atomic nucleus
Answer:
The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom
Explanation:
Answer:
A atomic nucleus is a a region of protons and neutrons in the middle of an atom.
Can you help me please it’s science and i will give you a branlist
Which statement describes the effect that a DNA mutation most likely has on an organism?
A. The mutation results in a gene that codes for a different protein.
B. The mutation causes the cell to no longer produce proteins from altered genes.
C. The mutation causes the cell to reject the existing genes and proteins made from those genes.
D. The mutation produces extra copies of genes that the cell uses as backups during protein production.
The mutation causes the cell to no longer produce proteins from altered genes. So, the correct option is (B).
What is Mutation?A mutation is defined as a change in the nucleic acid sequence of the genome of an organism, virus, or extrachromosomal DNA where the viral genome consists of DNA or RNA.
Mutations are of following types:
Chromosomal Alterations.Point Mutations.Frameshift Mutations.Mutation plays an important role in evolution where the ultimate source of all genetic variation is mutation. Mutation is important as the first step in evolution because it creates a new DNA sequence for a particular gene, creating a new allele.
Thus, the mutation causes the cell to no longer produce proteins from altered genes. So, the correct option is (B).
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Which of the following statements about hypotheses is NOT true? A) Hypotheses need to be tested before they become theories. B) Hypotheses are possible answers to scientific questions. C) Hypotheses may be replaced after experimentation. D) All hypotheses have been proven true.
Answer:
D
Explanation:
All hypotheses have been proven true is the false statement .
What is hypotheses?
A hypotheses , is a testable statement about the relationship between two or more variables or a proposed explanation for some observed phenomenon.
What is the hypotheses in research?
A research hypotheses is a statement of expectation or prediction that will be tested by research.
Hence ,option D is correct
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True or False: Decomposers replenish nutrients into the "abiotic" phase of a nutrient cycle.
Answer: true
Explanation:
identify an independent variable in the experiment graphed in figure 1. based on the data in figure 1, identify a control that shows that sepin-1 rather than something else in the culture medium is inhibiting that growth of the cancer cells
Answer:
Explanation:
This question is incomplete because of the absence of the graph. However, the independent variable of an experiment is the variable that is not affected by any other variable during the course of the experiment but is however intentionally or unintentionally predetermined by the researcher conducting the experiment. For example, in an experiment to determine the effect of age on blood pressure; age is the independent variable because the age class/groups of the individuals to be used can be determined by the researcher also the age cannot be affected by the pressure (the age of a person cannot change because of an increase/decrease in blood pressure).
Also, the control of an experiment is the variable/data in which other data in the same experiment are compared to. For example, in an experiment to determine the effect of a substance (such as sepin-1) on the growth of cancer cells (using a culture medium), the control can be the culture medium that was not given any substance or the culture medium that was given a pure substance of no effect like water. This means, in this control culture medium, the cancer cells will continue to grow normally while that growth will be compared with what is seen in the culture medium treated with sepin-1.
What process occurs at the boundary between the capillaries and the alveoli?
Answer:
Diffusion.
Explanation:
Oxygen in the lungs diffuses from the alveoli into your bloodstream through capillaries and carbon dioxide diffuses from the bloodstream into the lungs also through these capillaries. The carbon dioxide is then breathed out.
Hope this helps! :)
is glycerol polar or nonpolar
Answer:
non-polar
Explanation:
Glycerol has three polar Oxygen-Hydrogen bonds but these are attached to hydrocarbon chains which are relatively non-polar.
Where is the youngest crust material found on Earth?
A. at the tops of
mountains
B. on the continental shelf
C. under continental
centers
D. along subduction
zones
E. at mid-ocean ridges
Answer:
I think the youngest crust on earth would be the mid-ocean ridges
Explanation:
I hope this helps with your question!
PLEASEE HELP GUYS I WILL MARK BRAINLIEST
Answer:
C i think
Explanation:
DNA carries the code to make what organic compound
Answer:
DNA in the cell nucleus carries a genetic code, which consists of sequences of adenine (A), thymine (T), guanine (G), and cytosine (C) (Figure 1). RNA, which contains uracil (U) instead of thymine, carries the code to protein-making sites in the cell. To make RNA, DNA pairs its bases with those of the “free” nucleotides.
Explanation:
compare and contrast a cell membrane and cell wall.
Answer:
here
Explanation:
a cell wall is only found in plant cells to provide protection and structure a cell membrane is found in plant and animal cells and its basically a filter and decids what gets in and out of the cell
How is the frequency of a wave measured?
Answer:
Wave frequency can be measured by counting the number of crests (high points) of waves that pass the fixed point in 1 second or some other time period. ... The SI unit for wave frequency is the hertz (Hz), where 1 hertz equals 1 wave passing a fixed point in 1 second.
Explanation:
have a good day
The frequency of a wave measured is by counting the number of crests.
What is the frequency?The hertz (Hz) is the SI unit for wave frequency, and 1 hertz is equal to 1 wave passing a fixed point in 1 second.
The time for one cycle, or the period, is multiplied by the reciprocal of one to obtain the frequency. The unit of frequency is Hertz or Hz. The 'time base' (seconds per division) from the oscilloscope controls is used to calculate the period.
The number of wave crests that pass a specific point in a specific amount of time, as measured in physics. The hertz (Hz), which equals one crest per second, is the most widely used frequency measurement unit.
Therefore, the number of wave crests (high points) that pass a fixed point in a second or another time interval can be used to calculate the frequency of a wave.
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Which of the following is made of cells?
Answer:
need more information to answer this question
Give two examples of fermentation in real life.
Answer:
yeasts or other microorganisms breaking down a substance, or a state of excitement.
Explanation:
Describe the biological needs for cells to be surrounded by a membrane that is selectively permeable for different materials.
Your teacher has given you a sample of soil to examine. Would you use a dry mount or a wet mount to examine it? Explain your reasoning.
The teacher has given you a sample of soil to examine. Dry mount because it won’t make the soil wet or turn it into “mud”.
What is soil ?The soil is a mixture of different components that contains minerals, organic matter, and living organisms, it is a loose sediment. there are different types of soil like Clay Soil, Sandy soil, Loamy Soil, Silt Soil
soil contain of 45% minerals, 50% spaces or voids and 5% organic matter, it involve in performing many important functions such as Providing a growth medium for the plants, Acts a modifier of the earth’s atmosphere and it is One of the most crucial components of the biosphere
The formation of soil occur by weathering of rocks. it leads to Solid rock can weather occur in three way such as Mechanical Weathering, Chemical Weathering, Biological Weathering
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What if the Earth was moved out to Jupiter's orbit which is about 5 times further from the Sun that Earth. How would the Sun's effect on the Earth change at that distance?
A. 5 time less gravitational force
B. 25 times less gravitational force
C. 0.5 times less gravitational force
D. 250 times less gravitational force
Answer:
D
Explanation:
9)
What is a major difference between prokaryotes and eukaryotes?
A) Prokaryotes have no nucleus.
B) All prokaryotes cause disease.
C) Eukaryotes contain more mitochondria.
D) Nucleic acids are founds only in eukaryotes.
Answer:
The primary distinction between these two types of organisms is that eukaryotic cells have a membrane-bound nucleus and prokaryotic cells do not. So i would think that it is A
Explanation:
Hope this helps!
Describe how weathering, erosion, and deposition operate on both small and large time and spatial scales. Be sure to make a claim, provide evidence or an example that supports the claim, and then the scientific reasoning why the evidence supports the claim.
Answer:
they all can operate on both small and large time and spatial scales by doing that one cycle uh
Explanation:
well to be honest I forgot what these mean again
Small - sand/leaves or small things could be blown away, takes not that long. Large - flood takes rocks/other things away, takes a long time.
What are weathering and deposition?The process by which dead tissues break down and change into more fundamental biological forms is known as decomposition. Decomposition is the first step in the process of recycling nutrients that have been used by an organism to build its body.
Deposition comes after weathering and erosion. A deposition is the third step in the formation of sedimentary rocks. It happens as a result of sediments like pebbles, mud, sand, and small rocks weathering, eroding, and moving.
Therefore, sand, leaves, or other small objects could be blown away quickly. Large - flood takes a long time and removes rocks and other objects.
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Comparing Microscopes
Dissecting/ Stereomicroscope Compound light microscope Scanning electron microscope (SEM) Transmission electron microscope (TEM)
Used to observe living organisms? Yes: alive or dead Yes: alive or dead No: dead only No: dead only
Does it produce a 2D or 3D image? 3D 2D 3D 2D
Surface and/or internal views? surface surface and internal surface, in great detail internal, including cellular organelles
Magnification 10X, 30X, 40X 40X, 100X, 400X (school) up to 2000X 1,500,000,000X and greater 200,000X
You are dissecting the mouthparts of arthropods, specifically this crayfish. This is a preserved specimen and your teacher has tasked you with dissecting the mouthparts and laying them out on the dissecting pan with the appropriate labels. Based on the information in the chart, select the best microscope for the job, citing evidence.
A) The crayfish is dead, a preserved specimen, so it would be appropriate to use either electron microscope for the task.
B) You should use the compound light microscope, on the lowest power. You can dissect the mouthparts using a 2D view with this much magnification.
C) The crayfish is a relatively large specimen, even the mouth parts. Since you are dissecting the mouth parts, you need a 3D view: you should use the dissecting microscope.
Eliminate
D) Because you are working in a high school lab, not a research or college lab, you have access to the compound light microscope, which may be used on living or dead specimens.
PLZZZZZ, HELP!!!!!!!!!
Answer:
C
Explanation:
The crayfish is a relatively large specimen, even the mouthparts. Since you are dissecting the mouthparts, you need a 3D view: you should use the dissecting microscope.
When 2 forces act in the SAME DIRECTION they are
HI NEED HELP URGENT, I'LL BE REWARDING BRAINLIEST.PLS ANSWER THESE WITH CORRECT ANSWERS
1. Clownfish make their homes among the stinging tentacles of sea anemones. The clownfish gain protection from predators while attracting prey for the anemones to eat. Why is this an example of a mutualistic relationship? *
• The clownfish benefit but the anemones are not affected
• The clownfish and anemones both benefit
• The anemones benefit but the clownfish is not affected
• The anemones are harmed by clownfish
2. Which of the following is a biotic factor within the ecosystem *
• The climate in the area
• The herbivore that feed on producers
• Amount of oxygen
• Amount of sunlight
3. Which of the following contains only biotic factors? *
• Temperature, pH and rainfall
• Algae, shrimp and humidity
• Frog, climate and insect
• Ant, grass and snail
4 . In all symbiotic relationships, at least one organism benefits *
• True or False?
5 . Lions kill and eat animals such as zebras and wildebeasts. Jackals then scavenge on the leftover remains. The jackals benefit from the lions without harming or benefiting them in return. What type of relationship is this? *
• Mutualistic
• Parasitic
• Commensal
• Competitive
Answer:
1 - b
2 - c or d
3 - d
4 - true
5 - c
Explanation:
what are the four characteristics of water?
1.It is a universal solvent.
2Pure water is transparent, colourless and odourless.
3.Pure water is a poor conductor of electricity.
4.Water in a pure form has a neutral ph i.e 7 which means it is neither acidic nor basic.
Name all the organ systems that you would use for walking from the front of the school to your
irst period class. Then describe why you are using each of those systems.
(Hint: use multiple systems in answer)
Answer:
Skeletal system and Nervous system.
Explanation:
All the organ systems we would be used for walking are:
The muscular system and Nervous system are used to walk from the front of the school to the first-period class.
• The muscular system has a specific function. This is used to walk because skeletal muscles control our body movements.
• Muscles are attached to bones so muscles cause the movement of those bones.
• So skeletal muscles involved in some activities are walking, running, writing and etc.
• The nervous system also very important which is comprised of the brain, spinal cord, nerves.
• Skeletal muscles are voluntary muscles without the brain's permission they can't work.
• So the Muscular system and Nervous system both are very important for movement because our body movements are regulated by the nervous system.
What are the similarities and differences between the different atmospheric layers?
Answer:
Compare and contrast the various layers of the atmosphere
The atmosphere has 4 layers: the troposphere that we live in near the surface of the earth; the stratosphere that houses the ozone layer; the mesosphere, a colder and lower density layer with about 0.1% of the atmosphere; and the thermosphere, the top layer, where the air is hot but very thin.
Explanation:
PLEASE HELP ME!!! (Number 9)
Answer:
all of they fill up space on each one the atoms are different but the all have atoms (solid atoms super close liquids kinda close gasses not close at all and they move alot)
Explanation:
What level of organization is a LIPID an example of?
A. Organ
B. Tissue
C. Macromolecule
D. Molecule
Answer:
the answer is d molecule
What is the most common molecule in living things? A. CO B. He с. А,о D. CO
Answer:
proteins
Explanation:
Which of the following best describes the way the water will flow through the semipermeable membrane
Answer:
by osmisis
Explanation:
from region of high water potential to one with low water potential