Answer:
The used up all their resources too fast and weren't able to regrow them in time; they eventually basically killed each other off.
Explanation:
Arrow a should point to muscle tissue, arrow B should point to an organ, arrow c should point to organ system.
The process of microsporogenesis
B. Stomata. These are the holes in leaves that gases pass through. So, while leaves have something to do with it, petals do not, so D is close but wrong answer.
