1) closed circulation
2) The spleen can easily be damaged if someone suffers a sever injury to the stomach. When the spleen is damaged, it can cause pain in the abdomen, dizziness, and pain in the left shoulder.
Answer: A) wastes
Explanation:
More people, more littering
I think the answer is B because it happens slowly and through natural selection
I agree because an ecosystem and a host are basically the same thing.
