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Which of the organ systems listed below plays the most important role in protection of the human body from invasion by pathogens? 

Which organ system plays the least role in maintaining optimal conditions of the animal body? 

Evidence suggests that an asteroid struck the Gulf of Mexico near what is now the Yucatan Peninsula about 65 million years ago.  What was likely the cause of the cause of the loss of many plants?

The first stage in the gametophyte generation is  _____.

Extinction of species is often the result of interaction with other organisms.  Which of the following is NOT an organism-induced cause of extinction? 

The closest extant relative of the Tyrannosaurus rex is 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?    

Which of the following is NOT a function of circulatory systems in mammals?

*In fungi, plasmogamy results in _____.