What forms of sexual reproduction are found in animals?

Sexual reproduction with fertilization (most often found in nature, most eukaryotes are characteristic).
Sexual reproduction without fertilization – parthenogenesis (characteristic of bees, ants, aphids, lizards), from an unfertilized egg.
Hermaphrodism (flat and annelids, mollusks).
Conjugation (the simplest primitive form characteristic of bacteria, some algae).

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