Natural selection is when the more and better adapted organisms survive to reproduce and the weaker and less adapt die.
D fish as sponges don't exact have brains, hydra don't have brains and flatworms do not have brains.
Answer:
The difference is C
Anaerobic respiration uses oxygen, and aerobic respiration does not.
Explanation:
Temporal isolation is the type of reproductive isolation that would include this example.
Temporal isolation is a type of reproductive barrier in which two closely related species (plants or animals) are prevented from mating and producing sterile hybrids because of their different breeding time. The difference in the breeding time may be year, season (such as fall or winter) or by time of day (daytime or at night).
