Marsupials refute evolution

Most marsupials have the pouch opening facing forward, i.e., towards the head. Some marsupials will spend most of their time in water have the pouch facing backwards so that water will not flow into the pouch. Clearly a backwards facing pouch cannot evolve because when, during the course of gradual modification, it is in the intermediate position the young would fall out.

It will not do to claim that the change was made in a single step. A marsupial cannot make the move to an aquatic lifestyle until the orientation of the pouch is changed. Conversely the orientation of the pouch cannot be changed unless the move to an aquatic lifestyle has been made.

Ergo, marsupials with backward facing pouches cannot have evolved from marsupials with forward facing pouches and vice versa. Ergo they must be of separate kinds. Ergo evolution has been falsified.

Q.E.D.