Question

During a third-trimester ultrasound, what would a doctor expect to observe in a fetus?
initial development of organs
response to noise and light
presence of a tail-like structure
the first heartbeat

Answer 1

Response to noise and light.

Explanation: By the third trimester the organs are already developed (initial organ development occurs much earlier), the fetal heartbeat has been present for months, and any embryonic "tail" is gone. In late pregnancy the fetus shows movement and can respond to external stimuli such as sound and light.