Practice Exam

Question 18 • TPS EdX Biology

Variations within a species are an important part of Charles Darwin's theory of evolution. Which example can be explained by individual variation?

Answer

Owls and foxes compete fiercely against each other for small rodents in their habitat.

A population of brown bears has doubled in the past 10 years as its habitat size has increased.

Brightly colored cardinals are better able to survive and to reproduce than darker cardinals.

The food source in a lake is not enough to support the bass population, but it can support the trout.

Explanation

Individual variation means that members of the same species differ in traits. Choice C describes cardinals with different coloring and explains how that difference affects survival and reproduction. Competition between owls and foxes, changes in bear population size, and differences in food support between bass and trout do not describe variation among individuals of one species.

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