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BiologyWas Internal FertilizationFertilityEarly BilateriaNatural SciencesSperm BiologyEvolutionary BiologyGameteSperm StructureBiological Life CycleReproductive BiologyPublic HealthFertilisationReproductive Physiology
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The Early Evolution of Eukaryotes: A Geological Perspective
Andrew H. Knoll · Science · 1992 · 678 citations
The fossil record and the early evolution of the Metazoa
Simon Conway Morris · Nature · 1993 · 403 citations