Clements was challenged by another pioneer ecologist, Henry Gleason, who took the opposite

Clements was challenged by another pioneer ecologist, Henry Gleason, who took the opposite view. Gleason viewed the community as largely a group of species with similar tolerances to the stresses imposed by climate and other factors typical of the region. Gleason saw the element of chance as important in influencing where species occurred. His concept of the community suggests that nature is not highly integrated. Gleason thought succession could take numerous directions, depending upon local circumstances.

Which of the sentences below best expresses the essential information in the highlighted sentence in paragraph 6？ Incorrect choices change the meaning in important ways or leave out essential information.

A．We see nature as precisely balanced because nature is unchanging.

B．A precise balance of nature is not possible because of the complexity of natural systems.

C．Our sense that nature is precisely balanced results from the illusion that it is unchanging.

D．Because nature is precisely balanced, complex systems do not seem to change.

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