Match the following
Column−IColumn−IIA.Fishes and amphibians1.Fertilization is internal and development is externalB.Reptiles and birds2.Both fertilisation and development is internalC.Mammals3.Both fertilisation and development is external
A-3, B-1, C-2
Fishes and amphibians lay unfertilized eggs so fertilisation and development is external. In mammals both fertilisation and development are internal. But in reptiles and birds fertilisation is internal and development is external as they lay fertilized eggs.