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Khan Academy
Khan Academy: Reproduction/ Cell Division:human Fertilization; Early Development
Overview of fertilization and early human development, from conception leading to a zygote to blastocyst, embryo and fetus. [7:59]
Sophia Learning
Sophia: Zygote: Lesson 2
This lesson will explain how a zygote develops into an embryo. It is 2 of 5 in the series titled "Zygote."