Both the complexity of the phenomenon known as extinction and the vastness of the biosphere, having prompted many scientists to call for a large increase in the number of biologists working both in the field and in laboratories to clarify the relationships among the planet's many endangered life-forms.
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Aand the vastness of the biosphere, having prompted many scientists to call for a large increase in the number of biologists working both
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Band the vastness of the biosphere has prompted many scientists calling for a large increase in the number of biologists both working
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Cand the vastness of the biosphere have prompted many scientists to call for a large increase in the number of biologists working both
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Das well as the vastness of the biosphere have prompted many scientists to call for a large increase in the number of biologists who both work
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Eas well as the vastness of the biosphere has prompted many scientists to call for a large increase in the number of biologists who work both
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正确答案: C