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 all organisms today?

Question

anonymous · Answer

They passed on their genetic material to new cells when they reproduced. 

 They needed oxygen from the atmosphere to carry out cellular respiration. 

 They relied primarily on gases produced by active volcanoes. 

 They consumed all their energy from their environment.

anonymous · Answer

#2 is out because they do not need oxygen we do

anonymous · Answer

its the question and those are the options!

wach · Answer

C and D are also out; the gases emitted from volcanoes are usually greenhouse gases, and 'all' in D is too extreme. 
The correct option would be A, as all living organisms pass on their genetic code.