If the number of trees were decreased significantly in this enviornment, describe the effect it would have on at least one biotic and abiotic factor in the picture and why. *

Well I'm not completely sure but I've seen your question 2 times so I'll try.   As I know trees and green plants give off oxygen. So if a significant number of trees were taken from the environment I'm guessing the air wouldn't be as fresh, not that we'd be suffering, but there would be less oxygen. (not horrible though). I'm not sure on your biotic and abiotic part though, sorry.

Explanation:

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).