A ____________________ species is a species that is very important in a community’s structure because they tend to keep aggressive species from overtaking all other species in a community.

A ___________ is made up of all the different populations of organisms within a given area.

Which of these is NOT true of bryophytes?

Which group of invertebrates was the first group to have a circulatory system that is open instead of closed?

Which class of higher vertebrate animals possesses the following traits: endothermic animals with hair and mammary glands?

Which group of primates is found in Central and South America and possesses the following traits: prehensile tails and wide open, far apart nostrils?

Crustaceans such as crabs belong to which group below?

_________ is the scientific study of the interactions of organisms with their environments, in which organisms affect their environment and the environment affects the organisms within it.

Plants have a/an _________ life cycle.

Texas’s Legislative Budget Board comprises __________.