Answer:
Plankton
Step-by-step explanation:
The zooplankton is usually the second step in phytoplankton based food pyramids. Many zooplankters are herbivores on the phytoplankton (diatoms and dinoflagellates). Almost every marine animal phylum has a larval stage that can be found in the plankton (sponges, sea anemones, worms, snails, crabs, lobsters, sea stars).