Missing Link
Evolution from one kind of organisms to another occurs through sequential steps or stages. In case of the evolution of many organisms one or more stages of the sequence are yet to be discovered. These stages were constituted by such organisms which connected two large and distinct groups of organisms. These undiscovered or suddenly discovered organisms are termed as Missing or connecting links. Birds have been originated from a group of advanced Reptiles. The connecting or Missing Link between these two is Archaeopteryx.
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