Answer:
4
Explanation:
Because all the living things need carbon to make protein,carbohydrates,lipids
Answer: it produced oxygen as a waste product
Explanation: there was more free oxygen
Answer:
Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).
Explanation:
Hope this helps.
Polymers are many moments strung together. They are linked together by dehydration reactions. (Remove water)
