How are polar ice zones and
chaparral different?

Which technically is nasa developing that will astronauts reach mars

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.

If a checkpoint detects damaged dna, the checkpoint may