The movement of water molecules across a
selectively permeable membrane is known as

Osmosis.

Explanation:

osmosis is the movement of water molecules across a selectively permeable membrane.

they are known to reach a speed of 21 miles per hour

well for one plants are always the producer, so a is the answer. a wolf is more of the consumer(predator) and the deer is the prey so i know those two are out of the question. also mushrooms are fungi/fungus so a is the producer.