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Question

Cleidoic eggs are chracteristic of
  1. Mammals
  2. Reptiles and birds
  3. Insects
  4. Fishes

A
Insects
B
Fishes
C
Mammals
D
Reptiles and birds
Solution
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Cleidoic eggs are those eggs, which have a protective shell and are laid out of the water. The shell is porous to air and may be flexible or calcareous (hard). The eggs contain all the food the embryo needs to develop into a hatchling. The significance of the cleidoic egg is that it enables reproduction out of and often away from, water.
The eggs of insects and birds, which is enclosed in a protective shell limiting the exchange of water, gasses, etc. These type of eggs are found in reptiles, birds, and monotremes.
So, the correct answer is option B.

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