A. Water being pumped in and out of guard cells.
Answer:
Ecology is the branch of biology that deals with the relations of organisms to one another and to their physical surroundings.
I don't have enough information but it could be natural selection or mutations.
Answer:
Ginkgos and Cycads
Explanation:
Gymnosperm plants such as Ginkgos and Cycads have flagellated sperm.
