In plants, I think the answer would be photosynthesis. I animals, I guess it's enzymes, the bloodstream, and a bunch of cell-level processes. I can't answer a lot more exactly since I'm not a specialist in the field.
But anyway, you’ve changed the subject. I replied to your assertion that evolution violated the 2nd Law by pointing out that living things increase in complexity every day. You asked what mechanism made that happen. Does that mean you acknowledge that increasing complexity in living things doesn’t violate the 2nd after all?