Biology · Reproduction

The Duckbill platypus is a unique mammal that has webbed feet and a body covered with waterproof dense fur. She lays 1 to 3 eggs. She incubates them for 10 days inside her body and then gives them birth. 

Reptiles usually lay eggs or give vaginal birth to their children and therefore this option is wrong.

Normally Mammals also tend to give vaginal birth, hence this option is not wrong.

Frogs tend to lay eggs and they hatch for the tadpole to come out.

Duckbill platypus is an ovoviviparous organism that lays 1 to 3 eggs. She incubates them for 10 days inside her body and then gives them birth.