Question

1. Which important event occurs in the second trimester of human development? (1 point)
A. The heartbeat of the developing human strengthens and can be heard of via
stethoscope.
B. The developing human starts responding to sounds.
C. The face of the developing human starts to form.
D. The developing human can begin to move its arms and legs.

Answer 1

B. The developing human starts responding to sounds.

Explanation: The second trimester (about weeks 13–27) is when the fetal auditory system matures and the fetus begins to respond to sounds. Face formation and initial limb movements occur earlier in the first trimester, and although the fetal heartbeat becomes easier to detect by mid-pregnancy, hearing/response to sound is a hallmark of the second trimester.