In Open-Water Marine Ecosystems, The__________ Occupy the Same Trophic Level

In open-water marine ecosystems, the__________ occupy the same trophic level as the giant sequoias (redwoods) in the forests of California.

A) tiny, multicellular zooplankton (?animal drifters?) that feed on phytoplankton
B) fast-swimming, fish-eating tuna
C) microscopic, single-celled algae (protists) called phytoplankton (?plant-like drifters?)
D) giant, squid-eating whales
E) microscopic bacteria that decompose all the other organisms once they have died