Hens are oviparous in which internal fertilisation takes place. The fertilised egg divides repeatedly to form an embryo inside the body. The embryo
however, travels down the oviduct with many protective layers forming around it. After the hard egg shell is formed around the developing embryo,
the hen lays the eggs outside. After about 3 weeks, the development of chick from egg takes place.
On the contrary, frogs are oviparous in which external fertilisation occurs. The frogs lay eggs and sperms in water, which comes in contact to
undergo fertilisation. In this way, a female frog’s eggs get fertilised by sperms outside its body, i.e external fertilisation.
The fertilised eggs are covered by a jelly for protection. The development of embryo takes place in the egg in water, i.e they are oviparous.