This week, I learned about the way humans breath. More specifically, we learned about what we breathed in and breathed out. Our class came to a conclusion that we breathed in oxygen and breathed out carbon dioxide. We tested this by breathing into jars with a gas sensor on it, and if the number on the sensor got larger when we breathed in to the jar, that meant that we breathed in oxygen. If the number on the sensor got smaller on the sensor after you inhaled into the jar , that meant that you breathed out carbon dioxide. By doing some research, we figured out that we breathed in O2( oxygen) along with C6, H12, and O6, which all together and combined create carbohydrates, or food/energy. I also learned about the different combinations of atoms which create different molecules of air, like 1 carbon and 2 oxygens create CO2, or carbon dioxide. 2 oxygens create an oxygen molecule. Another thing that I learned was about photosynthesis. This is the process in which plants use the energy that they collect from the sun to convert it into sugar, which they use as food.