Answer: it produced oxygen as a waste product
Explanation: there was more free oxygen
Nitrogen Fixation. Good luck :)
It is the first option. Atmospheric nitrogen is very stable so there fore hard to react with. But bacteria contain molecules that can break the bond of nitrogen.
It does not include plant sources.
CCAGAT , or B.
The reason why is because A only pairs with T, and G only pairs with C. So, if you have a strand with GGTCTA, the only possible pairing for that to replicate is CCAGAT.