$A$ student enters the museum and observes the animal specimens. He looks at the one marked 'whale' and calls it a type of fish. How will you explain to him that whales and fishes belong to two different classes? List any three distinguishing features to justify your statement.
(N/A) Whales belong to the class $Mammalia$, while fishes belong to the class $Pisces$. Here are three distinguishing features:
| $Whale$ | $Fish$ |
| $(i)$ It is a warm-blooded animal (homeothermic). | $(i)$ It is a cold-blooded animal (poikilothermic). |
| $(ii)$ It has a four-chambered heart. | $(ii)$ It has a two-chambered heart. |
| $(iii)$ It breathes through lungs. | $(iii)$ It breathes through gills. |
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