These questions have been pondered for many lifetimes. Numerous experiments have been conducted, but still the answers are not conclusive. Life, by definition, is the living cellular quality that separates plants and animals from such things as water and rock.
Life is a flowing cycle that continues forever, creating and destroying.
New additions are added as things evolve, while species are destroyed by carelessness. This cycle of life is a constant creator of needs and desires, such as hunger, thirst, and sex. Life is a grand partnership with all aspects working together to keep up the flow of things. It is hard work and rewards, questions and answers, triumph and defeat. Within a being, there is cooperation of systems which are both simple and complex.