Question

what do marine animals use to make their shells​

Answer 1

Answer:

calcium carbonate

The shell of marine animals is made up of calcium carbonate. Oceans and seas are rich in calcium and carbonates. These are used by marine animals for making their shell which protects them from external surroundings

Explanation:

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Answer 2

Explanation:

The shell of marine animals is made up of calcium carbonate. Oceans and seas are rich in calcium and carbonates. These are used by marine animals for making their shell which protects them from external surroundings...