Why are four images shown in each set of PET images? Why would scientists need to examine more than one PET image taken of a subject's brains

Explanation:

Four images are shown in each set of PET scans to highlight either ,, blood glucose levels ,, cancerous tumour cells ,, whether or not vital organs are working correctly - or if the treatment of what is being given to the patient is working or not . more than one PET image may be taken of a subject's brain to see if the results are reliable and conform to the problem .

( i think ^^ )

i would say the prokaryotic cells the prokaryotic cells are less complex, are usually found only in unicellular organisms and have more limited capabilities than eukaryotic cells.

the  frequency of a wave represents  the number of wavelengths that pass a specific point per second. the unit for  frequency  is hertz (hz).

happy to

pls mark as brainliest