What are the main distinguishing features of living from nonliving?

Living things differ from nonliving ones by such signs as: unity of chemical composition, unity of structural organization, openness, metabolism and energy, self-reproduction, self-regulation, development and growth, irritability, heredity and variability.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.