By the end of the first trimester of fetal development during pregnancy, formation of all the major organ systems is complete.

Name: By the end of the first trimester of fetal development during pregnancy, formation of all the major organ systems is complete.
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Quizplus · Accepted Answer

By the end of the first trimester (approximately 12 weeks) of fetal development, formation of all the major organ systems is complete. However, these organs will continue to develop and mature throughout the remainder of the pregnancy.

By the End of the First Trimester of Fetal Development