I believe it is temperature or rainfall. All of the factors are improtant but temperature comes first, cuz the temperature can also determine the air, and soil doesn't make a difference. Longitude doesn't have to do with an ecosystem.
Answer:
4: DNA is found in the nucleus of the cell
5: cell
6: A person has 23 pairs of chromosomes
7: Chromosomes, genes, DNA are different names for different parts of THE SAME thing
8: the genes that determine what you look like came from your PARENTS
9: the reproductive cells called SPERM AND EGGS each contain only 1/2 of the genes needed to make a person
10: All living things have the same genetic CODE
11: ATCG combine in different patterns to form different CHEMICALS
12: Each species has a different BLUEPRINT, but the same kind of DNA molecule
13: A(n) HORSE has 64 chromosomes
14: A chromosome can only be seen by using a MICROSCOPE
The answer to this is Quaternary.