Having smooth seeds is a dominant trait. having wrinkled seeds is a recessive trait. the offspring of two plants with wrinkled seeds will have

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.

not sure if this what   you'r looking for would be percent composition