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[–]Juniperius 15 insightful - 1 fun15 insightful - 0 fun16 insightful - 1 fun -  (0 children)

A sperm isn't just a smaller egg, and an egg isn't just a larger sperm. They are entirely different types of cells. An egg has a nucleus, mitochondria and other organelles, everything it needs to be a whole cell. It can live forty years in the ovary before emerging to become a new person. It's very nearly a single-cell organism in its own right. A sperm is just a bit of dna wrapped in a membrane. It has no substructures except for the tail. It doesn't process its own energy. It lives only a few hours. It's like comparing a virus to an amoeba. This isn't a matter of dimorphism because you are not talking about things that are just a different shape, size, color, or other superficial characteristic (morph = shape, form) but things that are entirely, fundamentally different orders of being.