Why are Mammalia considered viviparous with few exceptions??(NCERT STATEMENT)
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Most mammals are viviparous (which means they give birth to live young), except a few exceptions like the platypus and echidna the monotremes).
These exceptions lay eggs, as opposed to giving birth.
Anonymous:
wht made this difference
??
Their structural differences and reproductive tracts are different
ohk
Their other body parts are also quite different than other mammals..so that's why
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your answer is quite satisfactionable
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