*Adult echinoderms display radial symmetry. What evidence suggests that echinoderm ancestors evolved from bilaterally symmetrical ancestors?

The closest extant relative of the Tyrannosaurus rex is the _____

What features of charophytes provides evidence for charophytes being the closests relative to land plants?

Which ecosystem would be least affected if sunlight did not reach the Earth for an extended period of time?

The lungs and heart are located in the _____.

In a study locality, rabbits are the only prey of coyotes.  Biologists estimated the population sizes of rabbits and coyotes each year for 5 years and the data are shown in the table below.  Interpret these data about predator/prey relationships.    

Two of Darwin’s finches display a character displacement when they occur as sympatric species. Which of the statements correctly interprets the graph?    

Recent extinctions of species can be attributed to several causes.  Which of the following is not considered a major cause of such extinctions?  

A small island has stable populations of plants and animals, including one species of hawk as the only predator. The removal of the hawks could cause ____________ population size.

In the vascular bundles of most dicot stems, primary phloem differentiates toward the ________of the stem, while primary xylem differentiates toward the ________of the stem.