A professional athlete often runs long distances.

Some of the steps that enable the athlete
to run are shown.

Step 1: The athlete eats food before running.
Step 2: The food is broken down into nutrients.
Step 3: Usable energy is produced from the nutrients.
Step 4: The athlete's muscles use the energy to contract.


Which of the following provides a more accurate step than the one shown?

○ Step 3: Usable energy is produced from the nutrients during cellular respiration.
O Step 2: The only food molecules broken down into nutrients are fat molecules.
O Step 4: The athlete's muscles produce glucose when they use energy to contract.