question: _ play significant roles as producers in water-based ecosystems.
choices.text: algae macaws trout fish birds life Fungi Mosses.
choices.label: A B C D E F G H
formatted_question: _ play significant roles as producers in water-based ecosystems. (A) algae (B) macaws (C) trout (D) fish (E) birds (F) life (G) Fungi (H) Mosses.