The waxy coating on their leaves is being damaged by B) acid rain <span />
Good luck an search in the internet :)
This is very... open ended. Do you have some choices? If not, I will say that they would most likely be interested in Alaska and eastern Siberia being connected by ice. People could, at one point, simply walk across.
The correct answer is D, the salt crystals absorb heat and sink to the bottom of the ocean. I hope this helps.
