Answer:
Genetic variation is essential for natural selection because natural selection can only increase or decrease frequency of alleles that already exist in the population. Genetic variation is caused by: mutation
Explanation:
I guess it science Oklahoma And ecosystem and protozoans Andrew And thanks
<span>both the living and nonliving components of the biosphere.</span>
Answer: you didn't state the answers to choose from so i"ll just list common organic molicules: nucleic acids, proteins, carbohydrates and lipids.
Explanation:
There is no picture , what picture ?