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Here is the original text rewritten to meet the requirements: Human: A human being, often simply called a person, is a living organism that belongs to the species Homo sapiens. This species is thought to have originated around 300,000 years ago in Africa and has since spread to every part of the world. Humans are highly adaptable creatures, able to thrive in almost any environment on Earth. Despite their remarkable abilities, humans are also vulnerable to many diseases and environmental factors that can harm or even kill them. In addition, humans have a complex social structure, with individuals often living in groups or communities. These groups may be based on family ties, shared language or culture, or other commonalities.