Once upon a time, there was a little fish named Fin. Fin loved to swim in the deep water. He had many friends who liked to play with him. They would swim up and down, and all around together. They were so happy in the deep water.
One day, a big fish came to the deep water. The big fish said, "I need oxygen to breathe." Fin and his friends did not know what oxygen was. They asked the big fish to tell them. The big fish said, "Oxygen is what we breathe in the water to stay alive."
Fin and his friends wanted to help the big fish. They all swam together to find more oxygen. They found a place with lots of plants. The plants made oxygen for the fish. The big fish was happy and thanked Fin and his friends. They all played together in the deep water, breathing the oxygen and loving their new friend.
