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

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?

The vaccine in a flu shot contains weakened flu viruses. how does a flu shot work with the immune system? a. it destroys lymphocytes. b. it destroys macrophages. c. it activates macrophages. d. it activates lymphocytes.