10. Where is the mouth located on the starfish? __ 11. What is contained in the groove that leads from the mouth to the __ 12. Think:how do the tube feet help __

10. The mouth of a starfish is located on the **underside**, in the center of its central disc.11. The groove that leads from the mouth to the tip of each arm is called the **ambulacral groove**. It contains **tube feet**.12. Tube feet help starfish in several ways: **movement** (by attaching to surfaces and pulling the starfish along), **feeding** (by gripping prey and opening shells), and **respiration** (by facilitating gas exchange).