An obstetrician is giving a talk about teratogens. The doctor would state that damage from a given teratogen:

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The doctor would state that damage from a given teratogen is most likely to occur at high levels of exposure. The amount of exposure to a teratogen affects the degree of damage it causes to the developing fetus. Thus, the higher the level of exposure, the greater the risk of harm to the fetus.

An Obstetrician Is Giving a Talk About Teratogens