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.


and the vastness of the biosphere, having prompted many scientists to call for a large increase in the number of biologists working both

and the vastness of the biosphere has prompted many scientists calling for a large increase in the number of biologists both working

and the vastness of the biosphere have prompted many scientists to call for a large increase in the number of biologists working both

as 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

as 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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Prep2007E1-SC