blood flow from the mother to the fetus
they are passed to the fetus and cause imbalanced compounds that effect DNA
In Hinduism, the soul is believed to enter the fetus at the time of conception.
Absolutely YES! Substances of good/bad can be transported from what is inhale by the mother to the fetus by the process of "blood flow from the mother to the fetus" or entering the umbilical cord to the fetus .
The first structures by which toxins enter plants growing in contaminated soils is the xylem.
Xylems
xylem
Xylem (Apex)
Oxygen is supplied by the mother since the fetus has no air to breathe.
Because that's when the vital organs are shaped, heart, brain etc.
It has to get oxygen and get rid of CO2
My best bet is the same as cigarettes without some of the toxins, smoke is smoke and smoke is bad for your heath
critical period