Discuss how viruses challenge the cell theory. [4 marks]

Viruses challenge the cell theory because it states all cells arise from pre-existent cells. Also, viruses are considered non-living which challenges the first theory

The body has levels of organization that build on each other. Cells make up tissues, tissues make up organs, and organs make up organ systems. The function of an organ system depends on the integrated activity of its organs. For instance, digestive system organs cooperate to process food.