1.Contractile proteins actin and myosin are found in muscle tissue.

2. The skeletons of sharks and human embryos are composed of cartilage.

3.The lymphatic system helps to protect the body by destroying germs within the body.

4. Most of the nutrient absorption that takes place during digestion occurs in the small intestines.

5. The respiratory system removes gaseous waste (carbon dioxide) from the blood.

6. The Integumentary system contains the largest organ in the body, the skin.