Which of the following is the largest conceptual unit? 

A. ecosystem
B. community
C. food chain
D. population


A. ecosystem

Biology & Microbiology

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Which one of the following terms applies to the phylum Cnidaria?  

A.  radial symmetry B.  pseudocoelomate C.  Parazoa D.  triploblastic E.  protostome

Biology & Microbiology

Both rods and cones have four segments, each of which has a specialized function

Indicate whether the statement is true or false.

Biology & Microbiology

A typhoon devastates a population on "island A" and only a few individuals survive. Several generations later, the replenished population suffers from several inherited disorders that are very rare in other groups. A genetic event that explains this is

A) a population bottleneck. B) genetic load. C) a founder effect. D) natural selection.

Biology & Microbiology

Which of the following do NOT contain endoplasmic reticulum? 

A. noneukaryotes B. animal cells C. eukaryotic cells D. All of the choices are correct.

Biology & Microbiology