Answer & explanation:
Melanism occurs due to a genetic mutation that causes the excessive and concentrated production of the black pigment, called melanin. The consequence is living beings with darkened skin or fur. There are three types of melanism.
Adaptive melanism occurs by the need to adapt to the environment, a condition that will be passed through the generations. This melanism allows animals to camouflage themselves during hunting or to hide from predators.
Industrial melanism is related to human interference, especially industrial activities, in the lives of animals (dark-colored moths are the best-known cases). Air contamination is one of the main factors for this condition.
There is also pseudo-melanism, which partially affects animals and is generally motivated by genetic mutations. In certain species, the characteristic spots and stripes appear larger and darker than usual. This type of melanism is very present in cats such as tigers, cheetahs, leopards. However, other animals can still be affected.
All of the following options are examples of positive feedback EXCEPT:
a. increased strength and frequency of contractions as labor progresses
b.increased shivering and heat generation in response to cold temperatures
c. increased rate of fruit ripening in response to a gas released by nearby ripe fruit
d. increased platelet activation and recruitment to form a blood clot
Answer: The correct answer to the question is option B
INCREASED SHIVERING AND HEAT GENERATION IN RESPONSE TO COLD TEMPERATURES.
Explanation: Homeostasis is maintained by the control systems that detect and respond to changes in the internal environment, this is achieved effectively by the detector,control centre and the effector.
This dynamic process allows for the constant readjustment of many physiological variables.
Nearly all are being controlled by negative feedback mechanisms, positive feedback is much less common but important example is;
increased platelet activation and recruitment to form a blood clot and control of uterine contraction during childbirth.
The body temperature is one of the physiological variable that is controlled by negative feedback mechanism.
When the body falls below the preset level (close to 37°C), This is detected by specialised temperature sensitive nerve endings in the hypothalamus of the brain,where the body's control centre is located,the centre then activates mechanisms that raise the body temperature (the effectors). these includes;
- Stimulation of skeletal muscles causing shivering.
- Narrowing of the blood vessels in the skin reducing the blood flow to,and heat loss from the peripheries.
- Behavioural changed example; we put in more clothes to curl up.
When the body temperature rises within the normal range again,the temperature sensitive nerve endings are no longer stimulated,there signal to the hypothalamus will stop, therefore,the shivering stops too and the blood flow to the peripheries return back to normal.
This clearly explains option B which is the the correct answer of a negative feedback mechanism.
How do you age structure diagrams predict the growth of a population
Answer:
Are age-structure diagrams useful in predicting future population trends? How? Yes, age-structure diagrams allow scientists to determine if the number of individuals likely to have children will increase or decrease in the future.
Scientists warn that rising CO2 levels will have what effect on the Earth?
A
cause sea levels to drop
B
trap heat in the atmosphere causing the greenhouse effect
C
cause acid rain
D
speed up the next ice age
Answer:
B
Explanation:
Because Molecules of carbon dioxide (CO2) can absorb energy from infrared (IR) radiation. This animation shows a molecule of CO2 absorbing an incoming infrared photon (yellow arrows). ... This ability to absorb and re-emit infrared energy is what makes CO2 an effective heat-trapping greenhouse gas. And it will lead to green house effect...
Scientists warn that rising CO2 levels will have trap heat in the atmosphere causing the greenhouse effect on the earth. Thus, option B is correct.
What are scientific thinking?Scientific thinking is a type of information that includes intentional information seeking, including asking questions, testing hypothesis and making observations as well as recognizing pattern.
The scientific or scientists are clear as to the purpose at hand and questions at the issue. The scientific essential standards that should be implies on the elements of scientific thought such as clarity relevance depth, breath, logic and accuracy.
The scientific thinking prefers to thinking about the content of science and the set of reasoning process.The example of scientific thinking is that question information, conclusions and points of view which is strive to be accurate, relevant and precise.
Therefore,Scientists warn that rising CO2 levels will have trap heat in the atmosphere causing the greenhouse effect on the earth. Thus, option B is correct.
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What I wonder about movement of the Earth, sun, & moon?
Answer:
moon rotates and revolves around earth
earth rotates and revolves around sun
this rotation and revolution takes place in an oval shaped orbit..
compare and contrast the rate of photosynthesis in two areas.
Explanation:
its the 3 for the answers
Radio and cell signals are bent around objects like mountains and tall buildings. This can allow you to still have a signal, even without a straight line to the tower. This bending of waves around a barrier or through a slit is called ______.
Group of answer choices
interference
refraction
reflection
diffraction
The bending of waves around a barrier or through a slit is called ( D ) ; Diffraction
Diffraction is the term used to describe the situation/phenomena whereby waves ( radio or cell signals ) emanating from an antenna is bent around obstacles between the antenna and the signal receiver.
Diffraction of waves is usually caused by the interference of waves with itself due to the presence of an obstacle. in order to get to the intended receiver the waves bends around the barrier through diffraction after constructive interference within itself.
Hence we can conclude that the bending of waves around a barrier or through a slit is known as diffraction
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The muscles that laterally rotate and depress the scapula, as in shrugging and lowering the shoulders, are the __________.
What does the cytoplasm do?
Answer:
The cytoplasm provides a medium for the organelles to remain suspended. The cytoplasm acts as a buffer and protects the genetic material of the cell and also the cellular organelles from damage caused due to movement and collision with other cells.
Explanation:
5) Explain why the organisms at the top of a food chain (Eagles, for example) are more affected
by pollution in the ecosystem than organisms lower on the food chain (snails, for example)
Answer:
if pullution occurs, Fish may be consumed by birds and other animals and the pollution gets transferred through the food chains until it reaches humans.
Which argument is correct about the growth of an organism?
Only genetic factors affect the growth of an organism.
Only environmental factors affect the growth of an organism.
The combination of genes and environmental factors affects the growth of an organism.
Genes remove the environmental factors that affect the growth of an organism.
Answer:
The answer is C
Explanation:
Just think about it. How do you grow?
Which scenario best describes how climate trends might affect animal migration?
Animals found in the Arctic may move south.
Animals found at the equator may move north.
Animals found in higher elevations will move to lower elevations.
Animals found in lower elevations will stay in the same location.
Answer:
Answer is B
Explanation:
Animals either migrate northward or to higher elevations during rising temperatures as stated in the lesson
How are muscle cells and bone cells similar
Answer: A. Both make it possible for you to respond to your environment by moving.
Explanation:
why is the matrix of the bone hard ?
Answer:
Due to the presence of mineral salt in the osteoid matrix, which is a crystalline complex of calcium and phosphate (hydroxyapatite). Calcified bone contains about 25% organic matrix (2-5% of which are cells), 5% water and 70% inorganic mineral (hydroxyapatite).
Explanation:
I think you answered on of my questions before or was on one of mine lol.
I am not sure but I recognize the pfp
The appearance of mineral salt in the osteoid matrix, which would be a crystalline complex of calcium and phosphate, contributes to bone hardness and rigidity.
What are osteoid matrix?The osteoid is the unmineralized, organic portion of the bone matrix that constructs prior to bone tissue maturation.
It usually initiate the formation of bone tissue by secreting the osteoid as a series of specific proteins.
Thus, due to this, matrix of bone is hard.
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What causes mass wasting?
Answer: What causes mass wasting is rain, or even earthquakes. These events can occur rapidly and move as a flow.
Explanation:
Answer:b
Explanation:
9. If Seneca decides to walk across town to a store that is .95 kilometers away and
she has only 25 minutes to get there, what speed does she need to maintain in
order to reach the store on time?
Answer:
95k / 25mn = 3.8m/s
Explanation:
I did this this morning...but i'm not sure whether it's right or wrong.
who would win in a fight and how? Silver carp or paddlefish
Answer:
silver carp hope it helps
How do each growing stage of an insect vary?
Answer:
Most insects change in form during their development, and the successive stages are not all alike. This change in form is called metamorphosis. It is controlled by a juvenile hormone secreted by glands in the insect's head. The juvenile hormone is released during each molt, but the amount decreases each time.
Explanation:
what is the correct way to classify organisms in science
In an unstable environment where growing conditions are constantly changing, which mode of reproduction in plants provides the best chance for survival, and why?
Sexual reproduction; it increases the chance of survival by producing many genetically identical offspring.
Sexual reproduction; it increases the chance of survival by producing many genetically identical offspring.
Asexual reproduction; it increases the chance of survival by introducing little genetic variation in offspring.
Sexual reproduction; it increases the chance of survival by introducing genetic variation in offspring.
Asexual reproduction; it increases the chance of survival by producing many genetically different offspring.
Answer:
The answer is D
Explanation:
An element with 13 protons has an atomic mass of 27. Its number of neutrons is
Which parts of the water cycle require the water molecules to give away heat energy (cool
down)?
The part of the water cycle that require the water molecules to give away heat energy is : Condensation
Meaning of water cycle and condensation
A water cycle can be defined as the cycle that entails the continuous and consistent movement of on the the earth surface, which is above the earth surface and below the earth surface.
Condensation is a process where gasses changes to liquid. it is the cooling down of water molecules that are in form of vapor and converting to water in its liquid form.
In conclusion, The part of the water cycle that require the water molecules to give away heat energy is Condensation
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DNA is genetic material that makes up living things and folic acid
Answer:
The correct answer is option (C) The amount of folic acid is the independent variable, and the DNA synthesized is the dependent variable.
DNA or the deoxyribonucleic acid is made up of the nitrogenous bases called the purines and pyrimidines. Folic acid or the vitamin B9 is essential for the synthesis of these nitrogen bases of the DNA. A scientific experiment conducted always has two parameters, a dependent and a independent variable. A dependent variable in an experiment is a variable which is being tested and measured. In the experiment Jon is conducting, the amount of DNA becomes an dependent variable which is being tested and measured in presence of folic acid. An independent variable in an experiment is the variable that is changed or controlled in the scientific experiment to test the effects on the dependent variable. Here, folic acid becomes an independent variable as the amount of it is varied and tested to check the formation on DNA in bacteria. Thus, an independent variable always changes to check its effect on the dependent variable.
Explanation:
Object
Mass (kg)
Potential
Energy (J)
#1
#2
#3
#4
80
40
20
40
Height
(m/sec)
4
2
2
8
Answer:
Find potential energy, velocity and kinetic energy at each given point. (contains diagram)
HELPP :(
Which statement describes the most common ways in which students and professional scientists communicate the
results of their scientific research?
A.Students communicate results in oral reports to the class, and professional scientists communicate results in written
reports.
B.Students communicate results in scientific journals, and professional scientists communicate results in laboratory
reports.
O Students communicate results in laboratory reports, and professional scientists communicate results in scientific
journals.
O Students communicate results through secondary sources, and professional scientists communicate results through
primary sources.
The correct answer is C. Students communicate results in laboratory reports, and professional scientists communicate results in scientific journals.
Explanation:
Both students and scientists can carry out scientific research that involves studying a phenomenon by using the scientific method and scientific instruments. However, professional scientists and students differ in their level of knowledge and expertise in science. This makes scientific research made by scientists to have some differences in comparison to scientific research by students.
One of these differences is the way results are communicated. Indeed, students develop simple scientific research and the results are communicated in laboratory reports at school, colleges, etc. On the other hand, professional scientists develop complex research. Due to this, results are communicated in academic texts with strict criteria and that can be seen by other scientists, these are known as scientific journals.
What are two ways that you could change the path of light? what materials would you need to do it?
Answer:
Light travels in a straight line until something alters its path. Here are three ways light's path can be altered: it can be refracted, reflected, or absorbed.
Materials such as a mirror or aluminum can reflect light.
Materials such as water or glass can refract light.
Materials such as coal or clack paint can absorb light.
The two different ways that a person could change the path of light are refraction and reflection of light.
What is Refraction and reflection?Reflection is the phenomena of bouncing back of the light rays when it strikes the medium such as air, water, etc on a plane. Refraction can be defined as the process of the deflection of light when it passes through a medium that lead to the bending of light rays.
The two main ways in which the light's path can be altered include refraction and reflection of light.
For example, materials such as a mirror or aluminum can reflect light, materials such as water or glass can refract light.
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What determines how a mineral cleaves? O A. The color of the mineral O B. The size of the mineral O c. The presence of silicates O D. The strengths of the bonds between atoms
Answer:
D. The strengths of the bonds between atoms
Explanation:
What are phanerograms
Answer:
Phanerogams are terrestrial plants and more advanced than the cryptogams. These are also called as flowering plants. Following are the characteristic features of phanerogams: They have well-differentiated plants i.e. the plant body is divided into distinct root, shoot, and leaves.
The spermatophytes, also known as phanerogams or phaenogams, comprise those plants that produce seeds, hence the alternative name seed plants. They are a subset of the embryophytes or land plants.
It is known that some tumors are associated with tumor viruses. It remains unknown, however, whether or not other tumors such as those induced by chemical carcinogens are also associated with tumor viruses. Design a series of experiments to test the hypothesis that a chemical carcinogen-induced tumor cells contain altered genome (as compared to its unaltered state in the normal cell counterparts) and this genomic DNA alteration is responsible for the transformed phenotypes of the tumor cells. Include in your experimental design the following:
1) the overall strategy,
2) the reagents chosen including controls and why they are chosen,
3) at least four types of transformation assays, including both in vitro and in vivo assays, to be used to measure the properties of transformed cells, and
4) the strategy to interpret the results and to draw a conclusion.
Answer:
Experimental procedure:
1- To expose cell lines to both chemical carcinogens and viruses known to produce cancer (e.g., Epstein-Barr virus, hepatitis B virus, human papillomavirus, herpesvirus-8, etc) simultaneously.
2- By using real-time PCR (RT-PCR), to amplify mRNAs for specific target oncogenes both in normal cells and in cells that acquired cancer traits such as, for example, cell proliferation and survival. During this experimental procedure, it is required to include in vitro transformational assays including 1-anchorage independence, 2-morphological transformation (where the cells are scored for lack of contact inhibition), 3-focus formation and 4-immortalization.
3- Also by RT-PCR, to amplify mRNAs for specific viral mRNAs (i.e., to determine the viral load) in cancer-related cell lines.
4- To determine if there is a statistical significance between specific oncogene mRNAs versus viral expression in cancer-related cell lines
Experimental controls:
- Negative control: normal cells (i.e., cells non-exposed to chemical carcinogens and viruses)
- Positive control: immortalized cell lines where it has been found that the target oncogenes are expressed. It is possible to obtain this genetic data from other studies (i.e., by searching this information in the corresponding scientific publications)
Explanation:
By using this experimental procedure, it is possible to identify if there exists a correlation between the presence of viral mRNA and oncogenes previously recognized for being amplified in different types of cancers in cell lines that were capable of developing cancer traits.
What is the process that leaves sediment in a new area called
Answer:
Deposition
Explanation:
Answer:
B
Explanation:
The answer is deposition
I like cheese do yall like cheeeeseeeee
Answer: I like cheese
Explanation: