Answer:
<em>B) Trees at high elevations</em>
Explanation:
The atmospheric conditions and precipitation toxicity is <em>most likely</em> to affect trees at high elevations more so than the other answers.
The tree leaves, which are the main key to the tree's photosynthesis, absorb the oxygen and Co2 from the air, which are converted into nutrients. Without proper nutrients, the trees may die out.
Cyanobacteria also known as one of the first organism on earth are responsible for producing nearly 80% of the oxygen on earth.
The answer might be A ! The chromosomes that build proteins !
Amino acids contain nitrogen, in which helps make proteins in your muscles, skin and hair, otherwise if we had none, we would probably just wither away