1-Fish:Fish are found all over the world with almost 28,000 different species.They have streamlined bodies ,which help them to swim fast against a water current.Their bodies are covered with scales,which protect them and help in their movement.Fish breathe through gills and swim through fins.They are cold-blooded vertebrates.They live in water.Examples are tuna,shark, salmon,eel etc. 2-Reptiles:Reptiles are cold-blooded vertebrates .Some live in water and some on land.Most lay hard-shelled eggs but some lay soft and leathery eggs.Their skin is dry and covered with scales,which provide them with protection.Most reptiles breathe through lungs.Examples are snakes,tortoises,alligators,crocodiles etc.