B) the decay of once-living things
Hope this helps have a great day!
Aids is one of the disease that damage little by little the immune system until the human body die.
<span>The generally accepted parts of modern cell theory include: All known living things are made up of one or more cells. All living cells arise from pre-existing cells by division. The cell is the fundamental unit of structure and function in all living organisms. hope this helps but you should be more specific in the future</span>
