10. Your heart, liver and lungs are made of many types of fissues working together. That makes your heart, liver and lungs examples of what?
11. Lungs, bronchi, and trachea working together are examples of___________
12. Fill in the Blank: skin cells working tog__________ether to form epithelial is an example of
13-15. Which part of the human body is more complex, your heart or your circulatory system?​

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