| 1 | Paul is then left to choose one box to open to retrieve the mussel. | |
| 2 | It typically has a few different types of fish, clams, mussels and prawns. | |
| 3 | Pisaster has everted its stomach out through its mouth, and it'sdigesting the mussel externally. | |
| 4 | They then placed a mussel in to see how the fish competed for food. | |
| 5 | They lived in dense groups of similar size and aged animals, like mussels and oysters do. |