Unit three was about heredity, evolution, and classification. It includes chapter five, six, seven, eight, and nine. If you hover over the unit tab, you will see each chapter. Click on the chapter tabs to go to each chapter. At the end of each chapter there is an outside link to another website contain information about what the the chapter was on.Heredity is the passing of traits from parent to offspring. Evolution is how species change over time. Classification is the grouping of things with similar characteristics.