Congratulations on completing this WebQuest project. Take a look at what you have learned about the phyla, Arthropoda and Chordota.
By now you know how the complementary activity of major body systems provides cells with oxygen and nutrients and removes toxic waste products such as carbon dioxide. This knowledge helps you to understand how as results of the coordinated structures and functions of organ systems, the internal environment of the human body remains relatively stable (homeostatic) despite changes in the outside environment.