Ezra eats a cheese sandwich for lunch. Cheese contains a lot of protein, and bread is mostly starch. Ezra plans to play basketball later in the afternoon. He is breathing normally.

What does Ezra need from the food he ate and the air he breathes so that he can play basketball? How do Ezra’s body systems work together to get the molecules he needs into his cells? How do his cells use these molecules to release energy for his body to run?