What are the first signs of life and what process did they start to use.

this process produced what gas as a by product

Sequoia national park  /  inyo national forest, california, u.s. mount whitney is the tallest mountain in california, as well as the highest summit in the contiguous united states and thesierra nevada—with an elevation of 14,505 feet (4,421 m).

Answerseafloor spreading;

Cpopulation density

Iwould say the answer is d