Cells are the smallest objects biologists study
It seems your Options haven't made it into your question
will edit this answer when you repair it
The answer is watershed.
sorry if I'm wrong.
Answer:
A logging company promises to plant five trees for every one of them that it cuts down. You may or may not have seen a forest affected by acid rain. The trees are stripped of leaves and branches and the whole forest appears to be like it's dying, which it is. Acid rain is caused by air pollution and has a very harmful effect on plant and animal life, any life really.
Explanation:
No se, solo quiero que me dejen preguntar mijitrin, aparte hablo español
