Why do you think the mammary glands went from keeping the eggs moist to a food source

I'm just wondering why the mammary glands went from sweat glands to keeping the eggs moist to a food source.

Original post by MylittlePlusle

I'm just wondering why the mammary glands went from sweat glands to keeping the eggs moist to a food source.

I should say that it was a modification in line with the change from oviparous to viviparous mammals.

Why? Because it allows the parent to more rapidly and effectively raise their young, providing an evolutionary advantage.

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