We call those forms with 'consciousness' as biological or having life. But then what is consciousness..? From microbes like virus, bacteria to animals including human beings, we see certain symptoms of life. Biological beings metabolize, grow, reproduce, die and evolve. We say such beings have consciousness. What we are seeing are the effects of consciousness. Consciousness causes either electrical signaling or chemical signaling in biological beings that runs growth, metabolism, homeostasis etc etc. This signaling serves as the underlying platform for life. Thus we define consciousness by the effects of signaling. But can we define consciousness more than this..? No. we can define consciousness only by its effects. Then why we are defining all the effects of signaling to just one cause called consciousness..? Why can't it be multiple causes..? Because we see this evolution of biological being into another across the evolutionary chain. Hence we map all of them to one consc