<span>The answer is "Aggression and competition".
Sociobiology, the deliberate investigation of the organic premise of social conduct. The term sociobiology was promoted by the American researcher Edward O. Wilson in his book Sociobiology: The New Synthesis (1975). Sociobiology endeavors to comprehend and clarify creature (and human) social conduct in the light of normal choice and other natural procedures.
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Thomas Jefferson called rights given by god natural rights.
Arkansas has the most dogs, while Vermont has the most house held pets!
I recommend google it's very cool thing called a search engine.
