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Why Are Fish Shaped The Way They Are?

What is a fish? A fish is a vertebrate (an animal with a backbone) that lives in water. There are more fish than any other kind of vertebrate - not surprising since our planet is mostly water. Now to our question – why ARE fish shaped the way they are? To answer that, it is important to understand the environment in which fish live. This affects their shape and how they survive. First of all, fish are cold-blooded animals. Mammals, including humans, are ‘warm-blooded’- their bodies can control their own temperature. Mammals can grow a layer of fat or fur to protect them from the cold, or they can take shelter in a cave. If they get hot, ...