Bacteria and viruses : pathogens :: a.
cytotoxic T cells and macrophages : pathogens

b.
cytotoxic T cells and B cells : white blood cells

c.
B cells and T cells : mucous membrane cells

d.
helper T cells and cytotoxic T cells : skin cells

Of the pollutants that form acids in the atmosphere, which is easiest to reduce? a. sulfur dioxide b. nitrogen dioxide c. ozone d. carbon monoxide

1. -define adaptation2 explain darwin's theories of descent with modification and natural selection in detail3. -explain how each of these provides evidence for evolution: a. -fossil record, including superposition and transitional fossilsb-anatomy, including homologous structuresc-biological molecules, including dna and proteins4. -explain the difference between convergent and divergent evolution.5. -define and give three examples of artificial selection6. -define and give one example of coevolution.7. -explain biodiversity and how it benefits humans.8. -explain a type of population lest affected by environmental change.

What gases are carried by the blood