I do not know if it’s a bad thing but it’s okay so if you don’t do have a great day
Answer:
The respitory system and the nervous system.
Explanation:
I'm pretty sure
Balancing, running, and jumping are all examples of <em>gross</em> motor skills.
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I quote from Wikipedia:
"Gross motor skills are the abilities usually acquired during childhood as part of a child's motor learning. By the time they reach two years of age, almost all children are able to stand up, walk, jump, run, walk up stairs, etc. etc."
Pollution from a near by city is your answer ;D
