1. Introduction to Biology

Why is the idea of common descent considered a conclusion rather than a directly observable fact in evolutionary biology?

Gradual speciation is more likely to be associated with small changes building up in:

How does inheritance play a role in the process of natural selection?

Which of the following best explains how wolves are a keystone species in an ecosystem?

The similarity of the embryos of fish, frogs, birds, and humans is evidence of ______.

In a laboratory simulation of natural selection in insects, which factor would most likely increase the frequency of a particular trait in the population over several generations?

Sexual reproduction is important to the survival of a species in a changing environment because:

Which of the following best describes divergent evolution?

Which of the following is an example of a specialist species?

The construction of a beaver dam is an example of which of the following?

Which example best demonstrates the importance of having knowledge of evolutionary relationships?

Change in a population over time is called _____.

In a typical pond ecosystem, is a frog considered a secondary consumer?

Which statement best describes the mode of selection depicted in the figure showing individuals with intermediate phenotypes having higher fitness than those with extreme phenotypes?

Which of the following scenarios is the best example of natural selection?