Keel (bird anatomy) keel; and ratites (from "ratis", "raft" — referring to the flatness of the sternum), having a subtle keel structure or lacking one entirely. However, this classification has fallen into disuse as evolutionary studies have shown that many flightless birds have evolved from flighted birds. The current definition of Carinatae now includes all extant birds. Keel (bird anatomy) A keel or carina (plural carinae) in bird anatomy is an extension of the sternum (breastbone) which runs axially along the midline of the sternum and extends outward, perpendicular to the plane of the ribs. The keel provides an anchor to which a
A Scientific Support for Darwinism case, as well as announce the results in a press release. The petition was not completed sufficiently early to submit it as part of an "amicus curae" brief for the Dover case. However, if the case was to go to the US Supreme Court, the petition could have been submitted as an "amicus" brief at that time. R. Joe Brandon emphasized that this "Four Day Petition" did not mean that scientific issues are settled by majority vote. What Brandon maintains is that this is an indication of the level of scientific consensus that accepts evolution as a viable established scientific