The first humans are thought to have lived in the open, grassy savannas of Africa. Think and explain how our body structure and behavior are adapted to provide life in the savannah.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

i think the answer is a.keratin is the pigment responsible for skin color.