Answer:
A person who continues exercising moderately for longer than _20_ minutes begins to use less glucose and more fat for fuel
Explanation:
Glycogen use during physical activity depends on the duration of the activity as well as it's intensity
A person who exercises moderately for longer than 20 minutes begins to use less glucose and more fat for fuel. Still, glucose use continues, and if the activity lasts long enough and it's intense enough, blood glucose declines, liver are muscle glycogen stores are depleted
