In this lesson students make a guess as to what was the first animal. The class watches the Sponge video from the shapeoflife.org and writes down what evidence they saw that sponges were the first animals. Then the class discusses what evidence they need to figure out what might have been the first animal. They watch the scientist video “Mitchell Sogin, Evolutionary Biologist: Proof of the First Animal” and write down the evidence that is presented for the sponge being the first animal. They consider what other evidence they would like to investigate and how their ideas have changed since they were first asked the question in the beginning of class.