In our lesson, the lymphatic system, I choose the concept of immunity which is the body's defense against invading microbes. In my everyday life, it is important that I stay healthy and keep my immune system strong, so I do not become sick. As we are in a pandemic, I got vaccinated against the COVID-19 virus as the vaccine, specifically Pfizer-BioNTech, contains a spike protein which triggers one's immune response so in the future, when the body actually encounters the actual virus, our immune cells already recognize it. I also do not want my cells to feel alone in their battle against invading pathogens, so I make sure I get proper sleep, eat adequate food at the right time, and take vitamins to take care of my immune system. Recently, I also took a blood test to determine my blood type as I was not sure what my blood type was, I realized that it is crucial to know your blood type as our blood types have different antigens and antibodies. If we are transferred incompatible blood types, our blood cells may attack one another.