AP Biologyeasymcq1 pt
The contractile vacuole of freshwater protists functions to
A.expel excess water that enters by osmosis
B.digest engulfed bacteria
C.photosynthesize
D.store DNA
Explanation
Core Concept
In hypotonic pond water, water constantly diffuses in; the contractile vacuole pumps it back out, keeping the cell from lysing — a classic osmoregulatory adaptation.
Correct Answer
Aexpel excess water that enters by osmosis
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