The answer is D. Hydrosphere, Geosphere, Atmosphere.
The doctor who is concerned that wilma may have a brain tumor recommends that a(n) positron emission tomography (PET) scan.
PET scan is a scan imaging test that allow doctor to check disease in human body. This scan uses a special dye that contain a radio active tracer.This scan provide information about blood flow and how body is using oxygen and sugar.
The number of electrons/protons (both are the same number) is equal to the atomic number.
Brainliest please :)
A the frenquency increases