1. Which component of skin protects against UV light?
•Melanin.
2. Which factor correlated with human populations losing skin pigmentation?
•Moving away from the equator.
3. Which factors were determined to directly cause the loss of skin pigmentation in humans as a result of natural selection?
•The impact of UV radiation on folate and Vitamin D levels in human populations.
4. Which situation demonstrates causation?
•A change in one variable produces a change in the other.
5. Which factor could have allowed the population of black peppered moths to increase in the late 1800s?
•Less predation
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Natural Selection Unit Test
5 of 145 of 14 Items
Question
How does an individual with a competitive advantage lead to the evolution of an entire species?(1 point)
Responses
Traits that are advantageous help certain individuals reproduce at higher rates, so those traits are more common within the population.
Traits that are advantageous help certain individuals reproduce at higher rates, so those traits are more common within the population.
Those who have traits that help them survive are able to reproduce, and their offspring have those traits, leading to a change in the species over time.
Those who have traits that help them survive are able to reproduce, and their offspring have those traits, leading to a change in the species over time.
Individuals that survive due to their competitive advantage are able to expand their range, similar to how the finches radiated out from one common ancestor on the mainland.
Individuals that survive due to their competitive advantage are able to expand their range, similar to how the finches radiated out from one common ancestor on the mainland.
Some individuals are better at competing for resources, and that allows them to survive droughts or other major ecological events, leading to the extinction of certain species and the survival of others.
Answer: Traits that are advantageous help certain individuals reproduce at higher rates, so those traits are more common within the population. Those who have traits that help them survive are able to reproduce, and their offspring have those traits, leading to a change in the species over time.
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