Question

What is the benefit of having a shell on a chicken egg?​

Answer 1

Answer:

But actually, an egg without a shell is often intact. ... You might even think it's a regular egg until you touch it! Chickens need a lot of calcium to create good, hard shells, so most incidences of shell-less eggs in an adult hens are related to not having enough calcium in the diet.

Explanation:

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Answer 2

Answer:

The innermost layer, called the mammillary layer, was softer, and slowly dissolved away its nanostructure to provide the growing chick with the calcium necessary to make its skeleton. The shell thus not only protects the growing chick, but also provides essential calcium mineral ions