Question: You are presented with the question "What was formed by exoskeletons?" and the following answer choices: - heat produced - remains of prehistoric life - layers of fat - The area was once underwater - the Great Barrier Reef - the body's largest organ - sedimentary rocks - it keeps an organism warm Now knowing that many corals secrete an exoskeleton that builds up to become a coral reef and australia's coral reefs, including the Great Barrier Reef, are no exception, choose the best answer.
Answer:
the Great Barrier Reef