Sam ran up the block. Sam ran down the block.
Sam went up the tree. Sam went down the tree.
Sam jumped. He hopped. He liked to play. Sam was out of breath.
Sam sat down. His dad sat down too. They were in the park.
"Daddy," Sam said.
"Yes, Sam," his dad said.
"Why do I breathe?" Sam asked.
"Well, Sam," his dad said. "You take in a special part of the air when you breathe in. This air and your food work so you can have energy. Then you can play."
"Where does the air go?" Sam asked.Paragraphs 10 to 20:
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