A vernier lab using heart rate monitor for human body unit. Interaction between nervous system and muscular system in response to a stimulus. Pretty darn cool lab!
No, not cockroaches and ants. These bugs are tiny, single-celled bacteria you can’t see. They blanket your skin. They also fill your stomach, intestines, lungs and mouth.
Don’t worry about being less than human, though. Bacterial cells are very small. All of these bugs make up only between 1 and 3 percent of your body weight.