James and I diverged from studying math to look more closely at the biology of plants, animals, and humans. We discussed the cell model for all living organisms and talked about organs composed of tissues of a certain cell type. We discussed some of the more prominent organ systems of the body including the respiratory, circulatory, nervous, digestive, and immune systems. Within a single cell, we discussed several key organelles including the cell nucleus, mitochondria, ribosomes, and the cell membrane.