NEET BIOLOGY

Detailed explanation-1: -Fish are aquatic, ectothermic vertebrates. Many structures in fish are adaptations for their aquatic lifestyle. For example, fish have a stream-lined body that reduces water resistance while swimming. Fish have gills for “breathing” oxygen in water and fins for propelling and steering their body through water.

Detailed explanation-2: -A fish is an animal which lives and breathes in water. All fish are vertebrates (have a backbone) and most breathe through gills and have fins and scales.

Detailed explanation-3: -The two animals which breathe through gills are Octopus, Shark, and Fish.

Detailed explanation-4: -In fish these take the form of fins, but in other vertebrates they are legs, arms, flippers, or wings. Some vertebrates, such as snakes, have no external limbs. Animals with backbones include mammals, birds, reptiles, amphibians, and fish.