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If fertilisation does not occur why does the thick lining of uterus break down?

Answer and explanation

Correct answer: Because support for an embryo is no longer needed

Step 1: The uterine lining thickens for a possible embryo. Step 2: If fertilisation does not occur no embryo forms. Step 3: So the lining breaks down and comes out as menstrual flow.

Related tags

MenstruationUterine LiningFertilisationReproductionWorld Of LivingScienceClass 10 Mcq

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