The specific effect that a teratogen such as thalidomide has depends on when the exposure to the teratogen takes place. This concept is referred to as a "critical period" in development.

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This is true. The impact of a teratogen on fetal development depends on the timing of exposure, with certain stages of development being more vulnerable than others. These critical periods vary depending on the specific structure or system being formed.

The Specific Effect That a Teratogen Such as Thalidomide Has