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MCAT Question A Day - 10/12/14 - Answer!

If the first living organisms on earth were heterotrophs, where did they get their energy?

A.  from eating each other
B.  from eating naturally formed organic molecules
C.  from the sun
D.  from eating dead organisms.

B is correct. If you answered A, you would have to explain what the first living organism ate because he had no one else to eat. Even when there were millions of living organisms, they could not survive off each other because one organism would have to eat many others, and there just wouldn't be enough to go around initially.

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