question: What plays significant roles as producers in aquatic ecosystem?
choices.text: carnivorous plankton great white sharks most living things animals in Class Aves baleen whales liverworts simple green plants absorbing nutrients
choices.label: A B C D E F G H
formatted_question: What plays significant roles as producers in aquatic ecosystem? (A) carnivorous plankton (B) great white sharks (C) most living things (D) animals in Class Aves (E) baleen whales (F) liverworts (G) simple green plants (H) absorbing nutrients