Question: Fact 1: Many corals secrete an exoskeleton that builds up to become a coral reef. Fact 2: Australia's coral reefs, including the Great Barrier Reef, are no exception. Given the two facts above, answer the question "What was formed by exoskeletons?" with the following options: - 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
Answer:
the Great Barrier Reef