Demographers usually measure mortality in terms of

Which laxative do intestinal bacteria use?

Environmental science is a __________.

“Abundance” describes the total number of _________ while “diversity” describes the number of _________.

Worldwide per capita use of water has

Species which are specialists

Wetlands are important to conservation efforts because

Hypnotics induce a state resembling natural sleep.

Intraspecific competition is competition among ________ for resources.

Which of the following scenarios are free from bias?