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The embryo is most vulnerable to teratogens during which stage of pregnancy?

mikael

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The embryo is most vulnerable to teratogens during which stage of pregnancy?

The embryo is most vulnerable to teratogens during which stage of pregnancy?
A) 1st trimester
B) 2nd trimester
C) 3rd trimester
D) Teratogens do not affect the embryo.

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padre

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