;Scientists think that little or no oxygen gas existed on the early Earth until photosynthesizing bacteria produced oxygen gas in abundance. What do these ancient photosynthesizing bacteria have in common with organisms today?

a)They needed oxygen from the atmosphere to carry out cellular respiration.
b)They needed sunlight to survive and to produce energy for food.
c)They passed on their genetic material to new cells when they reproduced.
d)They relied primarily on gases produced by active volcanoes.

Question

;Scientists think that little or no oxygen gas existed on the early Earth until photosynthesizing bacteria produced oxygen gas in abundance. What do these ancient photosynthesizing bacteria have in common with organisms today?

a)They needed oxygen from the atmosphere to carry out cellular respiration.
b)They needed sunlight to survive and to produce energy for food.
c)They passed on their genetic material to new cells when they reproduced.
d)They relied primarily on gases produced by active volcanoes.

ragingsquirrel · Answer

This is a science question...
O_o

anonymous · Answer

b

jamesj · Answer

Yes b.  If they are "photosynthesizing bacteria", then they need sunlight.  

The answer can't be a. Oxygen because this is what they produced.   It can't be c. Cells, because they are bacteria.  And it can't be d. gases from volcanos, because that's hardly an important requirement for life today.