The question 38 I can’t understand the question clearly

About how many years does it take for one cycle of surface water to become deep water and then surface water again in the oceans? 101001,000

The scales shown in the introduction measure mass, or the amount of matter in a particular object. the scientific law of conservation of mass states that matter cannot be created or destroyed during a chemical reaction, but it can change from one form to another. did the simulation support this scientific law? explain why or why not.

Why should organisms reproduce more offspring than will survive? select all that apply.