Question

When coral animals die, their skeletons fall to the sea floor

Answer 1

Hey
Here is Ur answer
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True This skeleton floor is the basis for many plants and other life to live 
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Hope this will help you
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Answer 2

When coral animals die , their skeleton fall to the sea floor.

And after many years, these skeletons are converted into various types of coral reefs.

Because,these skeletons mainly contain calcium carbonate compounds which turns into coral reefs,due to marine atmosphere's controlled environment.

And these coral reefs are economically very valuable.