Do you consider a person in coma, living or dead?
Or
In which conditions human beings are difficult to define as living?
A person lying in coma is not conscious of its surrounding environment. Thus, he/she is not capable of responding to the external environmental stimuli. The person is supported by machines for various functions of the body. The person is otherwise brain dead. Some of these patients never come back to normal life. They can neither he called living nor non-living or dead.