Question

Q ) what are shells ?


NOTE :

GIVE THE PERFECT ANSWER IN CLEAR WORDS IN SHORT !!

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Answer 1

Answer:

Seashells are the exoskeletons of mollusks such as snails, clams, oysters and many others. Such shells have three distinct layers and are composed mostly of calcium carbonate with only a small quantity of protein--no more than 2 percent. These shells, unlike typical animal structures, are not made up of cells.

Explanation:

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Answer 2

Answer:

Hi! you're answer is:-

The electrons revolve around a nucleus in a definite orbit called shells. These shells are also called energy levels.

Explanation:

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