Secondary since plants/animals already lived there, but got killed/driven out of the area they lived/thrived in/on.
Answer:
Peristalsis is a series of wave-like muscle contractions that move food through the digestive tract. ... There, the food is churned into a liquid mixture called chyme that moves into the small intestine where peristalsis continues. Stretching out a piece of intestine will make it easier to see the wave-like motion
Answer:
The equation is glucose + oxygen + carbon dioxide + water + energy is required in the form of light
