Caterpillars feeding on red oaks that were more than 50 percent defoliated grew to be only two-thirds the size of those feeding on trees with relatively intact foliage.
Oak leaves in areas unaffected by gypsy moths were found to have higher levels of tannin on average than aspen leaves in areas infested with gypsy moths.
The survival rate of gypsy moth caterpillars exposed to the wilt virus was 40 percent higher for those that fed on aspen leaves than for those that ate oak leaves.
Female gypsy moths produced an average of 25 percent fewer eggs in areas where the wilt virus flourished than did moths in areas that were free of the virus.
Gypsy moth egg clusters deposited on oak trees were found to have relatively large individual eggs compared to those deposited on aspen trees.
21. Which of the following best describes the function of the third paragraph of the passage?
It resolves a contradiction between the ideas presented in the first and second paragraphs.
It introduces research data to support the theory outlined in the second paragraph.
It draws a conclusion from conflicting evidence presented in the first two paragraphs.
It shows how phenomena described in the first and second paragraphs act in combination.
It elaborates on the thesis introduced in the first paragraph after a digression in the second paragraph.
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