Answer:
D. by taking in oxygen and cleaning out waste gases like carbon dioxide.
Explanation:
The respiratory system cleans out your carbon dioxide and replaces it with oxygen.
Natural selection is the process in which the more favorable traits due to mutation that are in a select few in a population produce more offspring then others. An example of this is bacteria resistant to antibiotics due to the faster reproduction of the resistant bacteria over the non resistant ones
D. Most of the energy that drives metabolism is supplied by ATP
