Sexual Reproduction in Animals. Fertilization. Sperm nucleus enters the egg and moves to the egg nucleus. The 2 nuclei join together and then form a zygote . External Fertilization *outside the body. Animals that breed in the water Many hazards in the environment Sperm and egg may not meet
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Turtle laying eggs
Parthenogenesis – development of unfertilized egg into an adult.- Bees & Wasps
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