How many genes make up the human genome? four: adenine, thymine, guanine, and cytosine 23 pairs of genes 20,000–25,000 genes 3 billion genes

20,000-25,000

Explanation:

Humans definitely don't have 3 million genes, its just not possible.

There are 23 pairs of Chromosomes in a human body

(Chromosome are where your genes are stored)

Therefore it has to be 20,000-25,000

c) 20,000-25,000

Explanation:

answer; (phospholipid);

1. is geographic distribution

2 is increasing complexity

3 is transitional forms