In a food chain consisting of phytoplankton ? zooplankton ? fish ? humans, the humans are

A) secondary consumers.
B) tertiary consumers.
C) quaternary consumers.
D) primary producers.


Answer: B

Biology & Microbiology

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The bony movable ?ap that covers the gills and gill slits is called the

(a) operculum. (b) cranium. (c) tympanum. (d) colon.

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The first vertebrates are seen in the fossil record of the:

A. Ediacaran. B. Cambrian. C. Ordovician. D. Devonian. E. Jurrasic.

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In pine trees, megaspores develop within a(n) ____

a. sporopollenin b. ovule c. seed d. pollen tube e. pollen grain

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Dental remains from australopithecines suggest that they had a diet similar to that of modern chimpanzees.

a. true b. false

Biology & Microbiology