Answer:
There are a variety of reasons as to why fish are different then reptiles.
Step-by-step explanation:
First, reptiles aren't capable of breathing in water due to them having lungs, while fish on the other hand can, since they use gills to breathe in water. Second, reptiles lay their eggs on land, while fish lay their eggs underwater. Third, fish use their fins for locomotion, while reptiles use their legs.
These are the differences between fish and reptiles. Hope this helps :)