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

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A critical period is a specific time in development when certain skills or abilities must develop or they may never develop. Rubella during the first trimester of pregnancy is a critical period because it can cause congenital rubella syndrome, which may result in serious birth defects. If contracted later in pregnancy, the impact is not as severe, making it a less critical period.

Rubella Has a Disastrous Impact If It Is Contracted During