[Audio] We all know what are mammals. And we also know how to they breathe. Which is lungs. And it is also very similar to the respiratory system of humans. So we will study about them in detail with the human respiratory system.. 

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We all know what are mammals. And we also know how to they breathe. Which is lungs. And it is also very similar to the respiratory system of humans. So we will study about them in detail with the human respiratory system

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And it is also very similar to the respiratory system of humans

study about them in detail with the human respiratory system.

We all know what are mammals. And we also know how to they breathe. Which is lungs. And it is also very similar to the respiratory system of humans. So we will study about them in detail with the human respiratory system

Scene 1 (0s)