Careful study of commonalities among different organisms suggests that all life on Earth Careful study of commonalities among different organisms suggests that all life on Earth depends on sunlight for energy. shares a common ancestor. lives either on the land surface or in the oceans. evolved at a time when Earth had plentiful oxygen in its atmosphere.

Yes.

Explanation:

Yes, all life on Earth depends on sunlight for obtaining energy and also shares a common ancestor of all organisms that lives on the land surface or in the oceans.  Sun is the major source of energy through which plants produces food for itself and for other organisms. All the organisms have common ancestors which evolved with the passage of time when the change occurs in the environment and is responsible for the diversity of organisms.

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.

not too sure but maybe in the hot springs.