Write a paragraph for this starter: You have signed up for a class called “Anatomy & Physiology”.
Write a paragraph to relate what you expect to learn in this class. In
your paragraph explain how anatomy & physiology are similar and how
they are different.

what is meaning of this question

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.