What kind of living and nonliving things do you think a marine biologist studies?

Everything he said is correct but they also study global warming and how and what animal it's affecting and how it global warming in the ocean hurts our supply of oxygen which %90 comes from the ocean they also track animal and let us know which small creatures we have to stay clear of for example the more colorful a sea worm is the deadlier it may be.

Marine biologists study changes in the ocean. so they will look at the chemical composition of deep waters and see how consecrated the oxygen is. They will also study the movements of the plates because when planted move it usually makes new food for deep life

they will also check animal concentrations in certain areas.

Another thing they do is track animal movements. this could be by putting a tracker on a whale or a shark or anything and watching its depths it goes or watching the distance it goes in a day.