Which civilization is known for building large stone heads

The Olmec colossal heads are stone representations of human heads sculpted from large basalt boulders. The heads date from at least 900 BC and are a distinctive feature of the Olmec civilization of ancient Mesoamerica.

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disorders of the brain include both behavior disorders and other psychiatric illnesses. the primary difference between a behavior disorder and another type of psychiatric disorder is the presence of choice. psychiatric conditions are considered to be involuntary while in behavior disorders, choices are essential.

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thist title points out that you are explaining the nature of the u.s. government. it is the most specific. a representative government consists of a government where decisions are taken according to a voting system. the most essential aspect of a representative government is found in the different structures where voting rights are granted to different groups of people. for example, voting for governor, mayor, president, local police chief etc.