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Question

Why do eggs of birds and insects have shells?

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Solution

Bird eggshells are made of calcium carbonate and insect egg shells are gelatinous in nature. During embryo development in the egg, they prevent
  1. Microbial contamination
  2. Desiccation
  3. Regulation of gas exchange
  4. In birds, the eggshell also provides calcium for embryogenesis.

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