Answer:
Viruses and non-cellular entities
Step-by-step explanation:
Viruses and non-cellular entities are not considered to be living organisms. According to the cellular theory, all living things are composed of cells. Moreover, all organisms have a series of characteristics that define life. These characteristics include, among others, homeostasis, order, reproduction, growth, development and evolution. Thus, living organisms are composed of cells that reproduce by cell division, and viruses are not capable of replicating on their own since they require to infect a host (i.e., their cells) to replicate.