defend the first theory of algal defenses against grazing
support the contention that phytoplankton numbers are controlled primarily by environmental factors
demonstrate the superiority of laboratory studies of zooplankton feeding rates to other kinds of studies of such rates
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
observe high phytoplankton numbers under natural lake conditions
discover negative correlations between algae and zooplankton numbers from their field research
understand the central importance of environmental factors in controlling the growth rates of phytoplankton
make verifiable correlations of cause and effect between zooplankton and phytoplankton numbers
invent laboratory techniques that would have allowed them to bypass their field research concerning grazer control
22. Which of the following, if true, would call into question Hardys principle of animal exclusion?
Zooplankton are not the only organisms that are affected by phytoplankton repellents.
Zooplankton exclusion is unrelated to phytoplankton population density.
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