You are presented with the question "What organisms are a source of food for many species of fish?" and the following answer choices: - remains of prehistoric life - whales - organic matter - sharks - gastropod shells - those on the ocean floor - Something made from fermented ricce - humans Now knowing that sponges are a source of food for many species of fish and like sponges, they are attached to the ocean floor, choose the best answer.
those on the ocean floor