What is the crucial defining characteristic of the Class Mammalia related to nourishing young?
Answer
Nourishing young via mammary glands.
The classification of the Welsh Springer Spaniel into the Class *Mammalia* is predicated on several defining biological traits that distinguish it from other vertebrate classes. While features like having hair or being warm-blooded are components, the singular, crucial characteristic that defines this class is the presence of mammary glands. These glands are responsible for producing milk, allowing the mother to nourish her dependent offspring directly after birth, a reproductive strategy unique to mammals.
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