For women, of the gametes (ovum) are lost by the time they reach puberty.
A. one-third
B. less than one-quarter
C. none are lost
D. nearly half

your answer is rna to the 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.