(A) Mammalian eggs are classified as $Alecithal$ (or $Microlecithal$ in some contexts) because they contain a negligible or very small amount of yolk.

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(A) Mammalian eggs are classified as $Alecithal$ (or $Microlecithal$ in some contexts) because they contain a negligible or very small amount of yolk. Since the embryo receives nourishment directly from the mother through the placenta,there is no need for a large yolk reserve.