if you stay in a cave with no light, you still maintain a 24-hour cycle of waking and sleeping. why?

the oceanic zone is typically defined as the area of the ocean lying beyond the continental shelf, but operationally is often referred to as beginning where the water depths drop to below 100 meters (328 feet), seaward from the coast to the open ocean.

explanation:

answer; ///(b) it is composed of four protein chains and four heme groups;