¹     Clark played all day. He biked. He ran. He jumped. He hopped.
 
²     "Clark," his mom said, "why don't you rest? Your muscles must be tired."
 
³     "My muscles? What are they?" Clark asked.
 
⁴     "Your muscles are the parts of you that help you move," his mom said.
 
⁵     "How many muscles do I have?" Clark asked.
 
⁶     "Over 600," his mom said.
 
⁷     "Wow!" Clark yelled. "That's a lot."
 
⁸     "They all have special jobs," his mom added.
 
⁹     "Like what?" Clark asked.

Paragraphs 10 to 20:
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