Starfish are found in oceans around the world. On the undersides of their arms they have small structures called "tube feet", which are very sensitive to chemicals in the water, helping them to detect food. When they detect food, they move their arms to travel in the right direction. Each of their arms contain two gonads, which release eggs or sperms into the water. a) Suggest and Explain three pieces of evidence from the passage that show starfish are living organisms.