What type of organisms would not carry out cellular respiration?
All organisms carry out cellular respiration (except viruses) - it is the basic process which supports life as we know it.
Viruses, on the other hand, are not always considered to be living, one of the reasons being that they do NOT carry out cellular respiration.
Cellular respiration is one of the processes that cells perform. Organisms do not perform this process. Instead they perform respiration. Cells use cellular respiration to obtain one of the three sources needed for them to live- oxygen. Without this process, cells would not be able to perform other functions.
Why would a multi-cellular organism prefer to use cellular respiration rather than fermentation as a method to produce energy?
They would prefer cellular respiration because cellular respiration is the metabolic processes whereby certain organisms obtain energy from organic molecules; processes that take place in the cells and tissues during which energy is released and carbon dioxide is produced and absorbed by the blood to be transported to the lungs (answer from google)