walrus often dive for 5 to 8 minutes suggest why having over three times as many red blood cell as humans help them perform this function

Mammals are relatively complex and intelligent animals.

They give birth to live offspring, have hair or fur on their bodies, and possess mammary glands that produce milk for their young. They breath air with lungs and have ears that stick out instead of the earholes, such as what reptiles and birds have.

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