A stomach that reaches out
The sea star holds on with tiny tube feet under its arms. If the two halves of the shell part a little, it can push its stomach out through its mouth to reach the soft flesh.
Two openings, one current
A sea squirt lives attached to a rock. Look at its two openings. Water enters through one and leaves through the other, bringing tiny pieces of food.
A net made of mucus
Inside the sea squirt is a fine net made of mucus, a sticky substance the animal makes. Tiny bits of food get caught in it. The sea squirt swallows the net and the food together.
