Question

use the text to put the events in order.
the seashells that you see on the beach were once the outer skeletons of animals like clams and oysters. these animals have soft bodies with two hard outer shells that fit together. between the body and the shell is an organ called the mantle. the mantle releases a chemical that contains calcium. this calcium then helps to form the animals hard outer shell, which protects the soft body. as time goes on, the shell continues to grow. it does this by adding new material at the wider edges of the shells. when an animal in a shell dies, it leaves its shell behind. this is why you see so many seashells at the beach.
a hard outer shell is formed. calcium is released from the mantle. an animal dies and leaves a shell behind. material is added to the edges.

Explanation:

According to the text, first, the mantle releases calcium. Then, this calcium helps form the hard outer shell. After that, material is added to the edges as the shell grows. Finally, when the animal dies, it leaves the shell behind.

Answer:

1. Calcium is released from the mantle.
2. A hard outer shell is formed.
3. Material is added to the edges.
4. An animal dies and leaves a shell behind.