Physics First has gained momentum across the country. Providing a radically different paradigm to teaching science at the high school level, the Physics First movement inverts the traditional science sequence by teaching physics to ninth grade students. One of the benefits of this change, supporters claim, is that it provides a foundation to teach chemistry and biology in later grades. As Spencer Pasero explains "Biology and chemistry are no longer the purely descriptive sciences they once were. Comprehending chemistry in terms of the structure and behavior of atoms relies on an understanding of physical principles and modern biology requires understanding the chemical functions of molecules such as DNA and proteins."