Question

how many genes make up the human genome?

two: adenine, thymine, guanine, and cytosine

23 pairs of genes

20,000–25,000 genes

3 billion genes

Explanation:

The human genome is known to have approximately 20,000 - 25,000 genes. The other options are incorrect: "two adenine, thymine, guanine, and cytosine" is about base pairs and not the number of genes; "23 pairs of genes" is incorrect as 23 pairs are chromosomes, not genes; "3 billion genes" is incorrect as the human genome has about 3 billion base pairs, not genes.

Answer:

20,000–25,000 genes (the option with "20,000–25,000 genes" text)