Question

8) Choose the best answer.

A mutually beneficial relationship between larger and smaller prokaryotic cells is termed _____.

eukaryotic

heterotrophic

spontanous generation

endosymbiosis



9) Choose the best answer.

Why do scientists today not believe that Miller's experiment accurately portrayed conditions of early earth?

Oxygen and hydrogen were likely present in early earth.

Methane and ammonia, needed for Miller's experiments, were likely not present in early earth.

Oxygen and hydrogen, needed for Miller's experiments, were likely not present in early earth.

Methane and ammonia were likely present in early earth.

Answer 1

8) endosymbiosis

9) Methane and ammonia, needed for Miller's experiments, were likely not present in early Earth.

Brief explanation: Miller–Urey assumed a strongly reducing atmosphere (rich in CH4 and NH3); later evidence suggests the early atmosphere was more neutral (dominated by CO2 and N2), so the original gas mix used was probably unrealistic.