Zygote
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A zygote is the fertilized cell that will grow into a baby animal. When a female's ovum and a male's sperm cell become one, this cell is called the zygote. The zygote then multiplies, and grows into an embryo.
Some animals keep the zygote in their bodies until it is a full-grown baby. The time between the forming of the zygote and the baby's birth is called pregnancy. Other animals do not keep the zygote in their bodies, but lay an egg. The zygote grows inside the egg until it is ready and the baby animal hatches.
