Which statement describing the cells in a body system is correct?

some cells in the system may be different from the other cells in the system but all cells are coordinated and work together

Explanation:

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.