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Worldwide per capita use of water has

Wetlands are important to conservation efforts because

Species which are specialists

Hypnotics induce a state resembling natural sleep.

Intraspecific competition is competition among ________ for resources.

Which of the following scenarios are free from bias?

Life expectancy is the

__________ stimulate GABA receptors in the brain so one is calm without drowsiness.

What lung disease is characterized by a fluid-filled cavity, usually a collection of proteins, tissue debris, and infection?   

Historically, the greatest threats to human health came from