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lara31 [8.8K]
3 years ago
5

When does the embryo form ?

Biology
2 answers:
ryzh [129]3 years ago
6 0

Answer:

During the first two weeks (the pre-embryonic period) the embryo moves through the uterine tube to the uterus where it will implant. The differentiation that establishes the organ systems takes place between 3 and 8 weeks in the first 8 weeks following fertilization (the embryonic period).

Explanation:

JulijaS [17]3 years ago
3 0

Answer:

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.

Explanation:

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