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'''Common descent''' is a [[scientific theory]] in [[Biology]] it can be applied on two levels, with a [[clad]] or group of species being said to share a recent common ancestor, or the broader theory 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]].

'''Common descent''' is a [[scientific theory]] in [[Biology]] it can be applied on two levels, with a [[clad]] or group of species being said to share a recent common ancestor, or the broader theory which states that all organisms on earth originated from common ancestors. The theory is usually used in support of the [[Theory of Evolution]].

Darwin wrote:

Darwin wrote: