Organ System, Organ coll, tissue
Im not writing your essay but some plants are used as medication and other remedies. plants are important because they provide food, medicine, oxygen, etc.
Answer:
c is just wrong because that is not how evolution works evolution is a small change in the DNA that takes a long time through many many generations not just as you or an organism get older and smarter you are not evolving
Answer:
cellular respiration...that's breathing out of humans
and through human activities like burning of fossil fuels...
