My neighbor is five months pregnant and still smoking a pack of cigarettes every day. Perhaps she is unaware that nicotine is a(n) for the fetus of a mother who smokes heavily.

Teratogen

Explanation:

Teratogen -

It is the cause of danger to the life of he fetus , and can even damage the body of the women and the embryo , is referred to as the Teratogen .

Hence , from the question ,

Smoking even during the stage of pregnancy , can cause harm to the unborn life , as the mother smokes very heavily .

Hence , from the given scenario of the question ,

The correct answer is Teratogen .

people are just afraid of difference. honestly no where in the bible does it say you can't be gay or bi or anything it says he loves all his children the same and he wants the best for us but we need to be truthful and all that yadda yadda anyways, god doesn't hate gays, he does hate hate, hypocrites, liars, and all that and even then he forgives those who ask for it. so your mum's reasoning is totally wrong xd sorry love, i had to rant a bit but i hate it when people do that. if anything i accept you! stay amazing! ^-^

the answer should be true