First slide
Sexual Reproduction
Question

Shell is not present around the eggs of

Easy
Solution

In oviparous animals like reptiles and birds, the fertilised eggs covered by hard calcareous shell are laid in a safe place in the environment; after a period of incubation young ones hatch out.
Frog eggs do not have a shell, so they need some kind of moisture to keep them from drying out until they hatch. 

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