why is it sometimes difficult to determine whether things are living or nonliving plz help ASAP

Living things,are made up of cells; exhibit characteristics of life, like growth, movement, reproduction. they evolve, and require energy for daily activities. Some of the daily life examples of living things around us are human beings, animals, plants and micro organisms.
Non-livings things do not exhibit any characteristics of life. They do not grow, respire, need energy, move, reproduce, evolve, or maintain homeostasis. These things are made up of non-living materials. Some examples of non-living things are stones, paper, electronic goods, books, buildings, and automobiles. (Hope that helps)

What is your question then