Which of these is an advantage of an ultrasound over an x-ray?
a. it does not require training.
b. it can produce images of soft tissue.
c. it uses more radiation
d. its equipment needs its own room

The following is an advantage of an ultrasound over an X-ray•Ultrasound  can produce images of soft tissue. It captures images of soft tissues that don't show up well on X-rays. Ultrasounds are also widely accessible and less expensive than other methods.

Correct B

alternate days of the week that you perform that activity