How many of the following characteristics can be used to distinguish a nematode worm from an annelid worm?

1. type of body cavity

2. number of muscle layers in the body wall

3. presence of segmentation

4. number of embryonic tissue layers

5. shape of worm in cross-sectional view

What was the prevailing belief prior to the time of Darwin?

What does the biological species concept use as the primary criterion for determining species boundaries?

Which statement best explains how evolution is detected in a population?

Which of the following is NOT a characteristic that is shared by embryophytes and Charophycean green algae?

In a genetically variable population under the influence of natural selection, what is the correct sequence of the following events?

1. Well-adapted individuals leave more offspring in comparison to poorly adapted individuals.

2. A change occurs in the environment.

3. Genetic frequencies within the population change.

4. Poorly adapted individuals have decreased survivorship.