URINARY SYSTEM AND MALE FEMALE REPRODUCTIVE SYSTEMS
PLACENTA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Where did all mammals originate from
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Antartica
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Australia
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Ocean
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None of the above
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Explanation:
Detailed explanation-1: -Mammals evolved on land around 160 million years ago. Each taxonomic marine mammal group evolved from a different group of land mammals, whose ancestors separately ventured back into the ocean environment.
Detailed explanation-2: -The first animals – including the common ancestor of all animals today – evolved in the sea over half a billion years ago.
Detailed explanation-3: -But, because they are mammals, we know that they must have evolved from land-dwelling ancestors. About 375 million years ago, the first tetrapods-vertebrates with arms and legs-pushed themselves out of the swamps and began to live on land.
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