Question at position 19 The fact that parental care defines Amelia evolution is driven home by what shared characteristic of all mammals?spinesplacental birthmammary glandsembryonic pouchesClear my selection

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BlackTom AI · Accepted Answer

The question asks to identify a characteristic shared by all mammals that underpins parental care. 
Option 1: spines. While some mammals have spines or spiny features, this is not universal to all mammals (it's not a defining trait across the group), so this option is incorrect. 
Option 2: placental birth. This is true for placental mammals, but not for all mammals (monotremes like platypus and echidna lay eggs), so it cannot be the universal characteristic. 
Option 3: mammary glands. All female mammals possess mammary glands, which produce milk to nourish offspring, a key feature that drives parental care across the group. This aligns with the concept of parental investment and is universal among mammals, making it the best-supported choice. 
Option 4: embryonic pouches. Pouch development is characteristic of marsupials in some species, but not all mammals, so this is not a universal mammalian trait. 
In summary, the correct inference centers on mammary glands as the shared, defining mammalian trait related to parental care, while the other options either describe non-universal traits or are not present in all mammals.

Question at position 19 The fact that parental care defines Amelia evolution is driven home by what shared characteristic of all mammals?spinesplacental birthmammary glandsembryonic pouchesClear my selection

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