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.
Biology & Microbiology
The first vertebrates are seen in the fossil record of the:
A. Ediacaran. B. Cambrian. C. Ordovician. D. Devonian. E. Jurrasic.
Biology & Microbiology
In pine trees, megaspores develop within a(n) ____
a. sporopollenin b. ovule c. seed d. pollen tube e. pollen grain
Biology & Microbiology
Dental remains from australopithecines suggest that they had a diet similar to that of modern chimpanzees.
a. true b. false
Biology & Microbiology