Answer: Pulmonary aortic valve
Explanation:
Explanation:
this is the best I can do for you sorry let me know if this helps any.
When a stem cell divides, it first becomes an immature red blood cell, white blood cell, or platelet-producing cell. The immature cell then divides, matures further, and ultimately becomes a mature red blood cell, white blood cell, or platelet.
3rd and 4th awnsers are correct
Answer:
vestigial structure that is C