1. Human System
... that I knew really could be seen by anyone that they are similar in the earth and in the human body. The two pairs I am going to compare are the water cycle to the circulatory system and skin to the layers of the earth. The water cycle is made up of Hydrogen, Oxygen, and other minerals. The earth has hydrogen and oxygen but also carbon, nitrogen, phosphate and a lot of other minerals. They ... both are made up of H2O because they are both primarily water. The water cycle ... ...
- Word Count: 909
- Approx Pages: 4
- Grade Level: High School