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teratogen
Yes, it will cause birth defect.
some
No; a teratogen is an agent that can cause birth defects.
vitamin b and c can cause serious birth defect
birth defect
Maybe
Which pills? If contraceptive pill, no.
PCOS does not cause birth defects, but it is a genetic disorder and can be passed down to your children. It also makes getting pregnant very difficult, most couples trying to get pregnant will try fertility medications which can cause birth defects but it is very rare to have a child with such a defect concieved with the aid of fertility medications.
PKU, can cause a serious metal retardess, and a (specific protein).
The organelle that would cause fatigue is called the mitochondria. However, it will only cause fatigue if there's a defect in it.
Some people may look like that because they were born with a birth defect. Incest and drugs are just two things that could cause a birth defect. (incest, if you don't know, is where say a brother and sister have sex. thus, if the girl got pregnant it would have a high chance to be born with a birth defect.)