It differs due to the life cycle of each tree, and the very specific way the trees go.
Peristalsis is a series of wave-like muscle contractions that move food through the digestive tract. It starts in the esophagus where strong wave-like motions of the smooth muscle move balls of swallowed food to the stomach.
D. It occurs before an organism can reproduce. Meiosis is the replication of sex cells required for sexual reproduction to occur.