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all organisms on earth originated from a single common ancestor
'''Common descent''' is a [[scientific theory]] in [[Biology]] which states that all organisms on earth originated from a single common ancestor. The theory is usually used in support of the [[Theory of Evolution]].
Darwin wrote:
:"When I view all beings not as special creations, but as the lineal descendants of some few beings which lived long before the first bed of the Silurian system was deposited, they seem to me to become ennobled."
Darwin wrote:
:"When I view all beings not as special creations, but as the lineal descendants of some few beings which lived long before the first bed of the Silurian system was deposited, they seem to me to become ennobled."