Choose the sentence that does not contain spelling errors. choose one answer. a. scientists are finding out more and more about hereditary diseases by studying genes. b. scientists are finding out more and more about hereditary diseases by studying jeans.

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 necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.