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  2. Irreducible complexity - Wikipedia

    Definitions. Michael Behe defined irreducible complexity in natural selection in terms of well-matched parts in his 1996 book Darwin's Black Box: ... a single system which is composed of several well-matched, interacting parts that contribute to the basic function, and where the removal of any one of the parts causes the system to effectively cease functioning.

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    The Chicxulub crater is an impact crater buried underneath the Mexican Yucat√°n Peninsula, with its center located offshore, near the town of Chicxulub.The crater is about 180 kilometers (110 mi) in diameter, making it one of the largest confirmed impact structures in the world; the asteroid whose impact (animation shown) formed the crater was at least 10 km (6 mi) in diameter.