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Jose and Sarah are running in the cross country meet. Their skeletal and muscular systems work to move them through the course. As they run, they breathe faster and harder and their heart rate increases.
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Jose and Sarah are running in the cross country meet. Their skeletal and muscular systems work to move them through the course. As they run, they breathe faster and harder and their heart rate increases.

This illustrates that body systems

User Maninekkalapudi
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Answer:

Step-by-step explanation:

Cardiovascular

User Ewcz
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the respiratory system, and the cardio vascular systems. 
User Bakhtiyor
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