These are organisms that live in the substrate?

This is the greatest source of oil in the marine environment?

This is an important herbivore in kelp forests?

This is what we call depths of 4000-6000 meters?

This was our most recent super continent?

Which of these elements makes up 95% of the body weight of organisms?

This is what we call the area between mean low tide and mean high tide?

At what temperature is water most dense?

This is a semi-enclosed area where fresh water and seawater meet and mix?

This is the amount of heat energy required to produce a unit change in the temperature of a material?