How do the molecules in the first question combine to form molecules of fat? They combine when water molecules (H2O) are removed from them.
They combine when oxygen molecules (O2) are removed from them.
They combine when water molecules (H2O) are added to them.
They combine when oxygen molecules (O2) are added to them.

scientists have discovered that hiv does not cause aids by the virus's direct effect on the host's immune cells, but rather through the cells' lethal influence on one another. researchers from the gladstone institutes have revealed that hiv does not cause aids by the virus's

it's c. (to reduce the greenhouse effect/carbon gasses)