The principle of access suggests that

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The principle of access suggests that the accessibility of a teratogen to a fetus or an embryo influences the extent of its damage. Mere access to a teratogen through the placenta is not a guarantee of some effects, and a teratogen can also access the fetal blood supply without first going through the mother's blood stream. Also, there are major differences in susceptibility to different teratogens among individuals within species as well as among different species themselves.

The Principle of Access Suggests That