The health promotion and disease prevention plan for the u. s. is called

It is called the Healthy People 2010

b. the carbon cycle ensures living things have a source of hydrogen

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.