How does an ultrasound produce an image of a fetus in the mother’s uterus?

Ultrasounds bounce inaudible sound waves off the solid structures in the body to create a 2D image.

The solid structures reflect sound waves, creating a white or gray appearance.

for e2020

i believe you meant to say air rather than hair so the answer is below ")

the dead sea, the lowest place on earth at 430 metres (1,410 ft) below sea level, has a correspondingly high typical atmospheric pressure of 1065 hpa.

answer; ///i believe the correct answer is (aids) acquired immune deficiency syndrome;