Which Type of Plankton are Tiny and Aquatic Heterotrophs

Question

Which type of plankton are tiny and aquatic heterotrophs?  
A) Zooplankton
B) Phyplankton
C) Tryplankton
D) Metaplankton
E) Holoplankton

Accepted Answer

Zooplankton are tiny, aquatic heterotrophs that feed on other plankton, including phytoplankton.