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1 : Gametes
2 : protozoa (Plasmodium, malarial parasite), algae (Chlamydomonous)
4 : nodes or eyes
5 : Cutting
7 : Plant tissue culture
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First, the zygote becomes a solid ball of cells. Then it becomes a hollow ball of cells called a blastocyst. Inside the uterus, the blastocyst implants in the wall of the uterus, where it develops into an embryo attached to a placenta and surrounded by fluid-filled membranes.
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