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The study of the evolution of species, including the role of sex and reproduction in the evolutionary process.
The short, evidence-based answer: under the classical biological definition tied to gamete type—small sperm-producing versus large egg-producing cells—there are two sexes in sexually reproducing speci...
Science, not parable, settles the old paradox: eggs in general predate chickens by hundreds of millions of years, and even under the narrow biological definition of a “chicken egg” the egg still comes...