(B)defend the first theory of algal defenses against grazing
(C)support the contention that phytoplankton numbers are controlled primarily by environmental factors
(D)demonstrate the superiority of laboratory studies of zooplankton feeding rates to other kinds of studies of such rates
(E)refute researchers who believed that low numbers of phytoplankton indicated the grazing effect of low numbers of zooplankton
21. It can be inferred from the passage that the “first theories” of grazer control mentioned in line 4 would have been more convincing if researchers had been able to
(A)observe high phytoplankton numbers under natural lake conditions
(B)discover negative correlations between algae and zooplankton numbers from their field research
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