Respuesta :
Answer:
CDE
Explanation:
That is my guess, not 100% sure.
Using process of elimination A and B arent right, because not all are caused by human intervention, and some require oxygen.
Answer:
CDE
Explanation:
That is my guess, not 100% sure.
Using process of elimination A and B arent right, because not all are caused by human intervention, and some require oxygen.