Ultrasounds are a type of radiology equipment. Ultrasounds(sonography) can be used to see images inside of the body, including kidneys, uterus and many other internal organs.
Ultrasounds are commonly used for pregnant individuals.another common use is to ee the brain and hips in infants
There can be many complications in a pregnancy. Ultrasounds can determine the sex of the fetus, see if there are amino bands around the limbs( which can cause limbs to fall off, etc. Most ob/gyns want to keep the pregnant individual calm and healthy as well of the fetus.
You need minerals in your daily diet to keep your bones strong, regulate your immune system, produce certain hormones and perform several other functions, but they do not give you energy.