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Heterotrophs came first because they could live off the minerals in the oceans (Heterotrophs are just organisms that take their source of energy from somewhere else - minerals do count). Autotrophs, however, could not have lived first because the ozone layer was not formed, and taking in the sunlight would have been the same as taking in harmful UV radiation that would have killed the autotrophs. The cyanobacteria (which are heterotrophs) were the ones that first helped create the ozone layer.

Actually, Cyanobacteria aren't heterotrophic. This WRONG answer led me cramming for our debate about Autotrophs vs. Heterotrophs. If you want to know about which came first, either search about primordial theory by A.I Oparin or go to http://leiwenwu.tripod.com/

(:

my yahoomail: lord_reverie@Yahoo.com.ph

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16y ago

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