Natural selection will be in full Jet Chip Wasp Kansas City Chiefs 3rd and whatever shirt action, but its like looking it from a different angle. Biology and chemistry look like 2 sides of the same coin, but it depends on the angle you observe the phenomenon. If you are starving for days, you are gonna constantly think of ways to feed yourself. Just write down your thoughts 1 day after you quit smoking and read them after 2 years. One can deliberately fast, but that is because the person decided that this will give him/her even more pleasure (e.g due to religious views, etc) than eating.
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Logic is also driven by self or other Jet Chip Wasp Kansas City Chiefs 3rd and whatever shirt parties aims and interests. They build and use their existing background that is written in nervous synapses and based on what they have learned so far, they seek of solutions or develop strategies to fullfil their aims and interests. They do so, because this will give them pleasure and avoid pain. In other words, cognition and logic is a tool of nature to serve its purposes. It is a homeostasis tool, and its no different than the lungs, the kidneys, etc on that sense. So to conclude, there are probably several mechanisms that enabled life to emerge, but the main mechanism that made biology different than chemistry is probably the fact that we are the observers.