When he was 6 years old,Perry used to chase his older brother,Marcus,in the backyard,but got winded sooner than Marcus did.Now that Perry is a 9-year-old,he can run faster and longer than ever before and has less trouble keeping up with Marcus's pace.This is a result of increased ____ in middle childhood.

Question

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The passage mentions that Perry can now run faster and longer than before, which indicates an improvement in his lung capacity. Lung capacity increases in middle childhood due to the development of lungs and respiratory muscles. Fine motor movement, flexibility, and myopic vision do not appear to be factors in Perry's improved ability to keep up with Marcus's pace.

When He Was 6 Years Old,Perry Used to Chase His