Toxic agents that can cross through the placenta and compromise an unborn child's development are known as teratogens androgens blastocysts antigens

Answer;

Teratogens

Explanation;

-Toxic agents that can cross through the placenta and compromise an unborn child's development are known as Teratogens. They are usually in the environment that the mother may be exposed to during pregnancy.

-Teratogens may cause physical or functional birth defects in the child or may halt the pregnancy outright. The major classes of teratogens include radiation, maternal infections, chemicals, and drugs.

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