The primary organisms that make up the deep scattering layer are:
A) zooplankton and fishes.
B) phytoplankton.
C) seston.
D) nanoplankton.
E) marine snow animals.

Question

Quizplus · Accepted Answer

The deep scattering layer is made up of organisms that exhibit vertical migration, which often includes zooplankton and fishes. These organisms come up to the surface at night to feed on phytoplankton and return to deeper depths during the day to avoid predators. Seston, nanoplankton, and marine snow animals may contribute to the overall biomass of the ocean, but they are not the primary organisms that make up the deep scattering layer.

The Primary Organisms That Make Up the Deep Scattering Layer