All beings are connected by the Systems Theory, which submits that one of the three critical functions of living systems is the exchange of information with its environment and with other living systems (the other two being the exchange of materials and the exchange of energy). Flor extends this argument, saying: "All living systems, from the simplest to the most complex, are equipped to perform these critical functions. They are called "critical" because they are necessary for the survival of the living system. Communication is nothing more than the exchange of information. Hence, at its broadest sense, environmental communication is necessary for the survival of every living system, be it an organism, an ecosystem, or (even) a social system."