Question

(9) What helps to fix the embryo to the uterus?​

Answer 1

Explanation:

As it was passing through the oviduct into the uterus it was enclosed by a membrane called the zona pellucida, which prevents the embryo from implanting itself. When the membrane does shed, however, it reveals a surface of cells coated with a protein that sticks to cells lining the uterine wall.

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