The correct answer is d. 3.5 billion years.
Prokaryotes were the first forms of life on Earth long before simple multicellular life appeared because of their ability to withstand extreme conditions. It is believed that the first living forms were bacteria combined with archaea in the microbial mat (multi-layered sheet).
Water, which is a chemical compound of hydrogen and oxygen in the ratio two hydrogen atoms for every oxygen atom, contains H2O molecules.
abiotic factors.
An abiotic factor is a non-living part of an ecosystem that shapes its environment.
<span> the sea floor is youngest near a mid </span>
<span>ridge and farther away.
i think this is the answer</span>
