Advancements in nuclear science have led to new technology which have been beneficial to society. many of the advances are used in medicine. which is not a medical use of nuclear energy? a) nuclear fusion b) radioimmunotherapy c) magnetic resonance imaging (mri) d) positron emission tomography (pet)

Option A, nuclear fusion

Explanation:

Nuclear fusion is the base reaction that is being carried out to produce nuclear energy along with nuclear fission reaction. Thus, the term "nuclear fusion" do not depict any form of application of nuclear energy.

However, the radioimmunotherapy, magnetic resonance imaging (MRI) and positron emission tomography (PET) uses nuclear energy as a better and advanced diagnostic and therapy  tool . Therefore, these three can be considered as application of nuclear energy.

Hence, option A is the correct answer.

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.