Rubella has a disastrous impact if it is contracted during the first trimester of a pregnancy yet has hardly any impact if contracted at the end of a pregnancy.This is an example of

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This scenario exemplifies a critical period, which is a specific time during fetal development when particular events must occur for normal development to take place. In this case, if rubella is contracted during the critical period of the first trimester, it can have disastrous effects on fetal development, whereas it has hardly any impact if contracted at the end of a pregnancy.

Rubella Has a Disastrous Impact If It Is Contracted During