Evolution Intelligent Design

At Phys.org: Chinese fossils show human middle ear evolved from fish gills

Researchers: Embryonic and fossil evidence proves that the human middle ear evolved from the spiracle of fishes. However, the origin of the vertebrate spiracle has long been an unsolved mystery in vertebrate evolution.
EH: It seems that evolutionists have a much softer definition of what amounts to proof than in other fields of science.