GEOLOGY

Detailed explanation-1: -Tiny marine animals which constitute limestone skeletons are called. foraminifera . coral reefs.

Detailed explanation-2: -Coral polyps are tiny, soft-bodied organisms related to sea anemones and jellyfish. At their base is a hard, protective limestone skeleton called a calicle, which forms the structure of coral reefs.

Detailed explanation-3: -For instance, most limestone forms at the bottom of the ocean from the precipitation of calcium carbonate and the remains of marine animals with shells.

Detailed explanation-4: -Limestone is a sedimentary rock which contains fossils as it is made up of shells and skeletons of tiny sea creatures.

Detailed explanation-5: -Coral reefs are rock-like structures made from the skeletons of small organisms in oceans.