It is important because 1/3 of our fresh water is above the suface which is not a lot considering the fact that 4% of the world's water is fresh water, which is what makes our fresh water very important and valueable.
Sorry if this is long I'm an over achiever.
Acid rain is a more serious problem on the East Coast.
These microscopic organisms are referred to as pathogens
The leaf support should actually be water. if in hot and dry weather, the leaf loss so much water that will make the plant cells flaccid and wilt.