What methods do anthropologist, archaeologist, historians, and geographers use to explore prehistory?

What kind of action is a cause of air pollution

Which statements correspond to cellular respiration? co2 diffuses passively into the cell. co2 diffuses passively out of the cell. co2 must be pumped out of the cell. o2 diffuses passively when produced inside the cell. o2 diffuses passively when converted to co2. o2 is pumped in and forces co2 out.

What is usually (but not always) related to the metabolic processes of living organisms in its organic form?