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Natural selection is the differential survival and reproduction in some individuals over others due to the possession of certain genotypic and phenotypic traits. It is responsible for the evolution of new species with more advanced traits.

A settled agricultural society is where the adaptation of human work and tools are fixed to a land plot for more than one growing cycle. This means changing hunting and gathering a lifestyle based on agriculture to stay in one place until the soil is exhausted. While hunter-gatherer is a simple society based on hunting and gathering food. The significant contrast between the two is the growth of innovative tools that mark the clear difference between them. In agricultural societies, there is a c...

Bullying is an aggressive behavior and tactic used to dominate and hurt others. It involves coercion, use of force, teasing, abuse, and threats. Bullying occurs at home, school, in the playground and online through cyberbullying.