I think A. Significant changes in the atmosphere.
Answer:
Homeotic genes controls the identity of body parts and the proteins it codes for are transcription factors. Mutations of the homeotic genes cause structures to form in the wrong place. Hox genes are responsible for directing the body plan along the AP axis and the proteins it codes for are transcription factors.
Answer:
endosmosis
Explanation:
this is because endosmosis results in movement of water inside the body
one of the "rules" it that every living thing came from a living thing.