In 15 words or less, describe how PCR works.

Heating and cooling via thermal cycles. This causes the DNA to split in half.

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:

thinking it would be d not too sure but i think it's right