Irreducible complexity debunks non-creation theories (Evolution)

Irreducible complexity is the argument that certain biological systems with multiple interacting parts would not function if one of the parts were removed, so supposedly could not have evolved by successive small modifications from earlier less complex systems through natural selection, which would need all intermediate precursor systems to have been fully functional.

Simply put, what  is meant by irreducible complexity is that a single system composed of several well-matched, interacting parts that contribute to the basic function, wherein the removal of any one of the parts causes the system to effectively cease functioning. 

Thus the small successive increases in information and material to produce some greater matter as evolution claims, would be impossible.

Example:

The human body could not function without the heart, blood and blood vessels existing simultaneously, all at the same time.  And could not be developed over billions of years, as the theory claims.