1. Fishes show great variety in their size. Some fishes are tiny while some are giant sized.
2. Some species of fish live in fresh water while some live in saline water.
3. Tail fin of some fish is used for changing directions while swimming, while some fish use the same as organ of defence.
4. Some fishes live for a long period of time as they have long life span, while others may have shorter life span.
These are variations seen in the body structure, habitat and life span of diffent fish.
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