The primary difficulty is the fact that we do not know all of the organisms that currently exist in the world along with those that existed in the past.
I’m sorry but do you want me to answer all of these I just need a yes or no I’ll answer in the comments (:
Answer:
b
Explanation:
Cellular respiration; complementary reaction to photosynthesis, because it's the reaction that cells use to break down glucose molecules and release atp.
Answer:
Air pollution will increase due to increased use of fossil fuels and the amount of natural space will decrease as suburban areas increase.
