The scince that specializes in the classification of organisms is

i think that d. wind is the answer.   i missed the question when i answered a. currents.

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 only is it colder, it also becomes darker, less salty, and more dense.