what additional procedure would best help determine whether these movements are due to active transport or to passive transport?

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:

b. read the phase at the intersection of any given temperature and pressure.

whats the answer to your question?