6. the basis for the energy in an ecosystem is provided by
a. consumers.
b. heterotrophs.
c. chemosynthesis.
d. producers.

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 brown mice / white sand dunes