<span>If you hold your breath, <span>carbon dioxide </span></span><span>builds up in your blood
The reason for this is:
When you exhale or breathe out, you exert or let out carbon dioxide. So, if you were to hold your breath, it would build up because it is not being exerted.
Hope this helped you!
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I would say "c" because he might want to but maybe not its his choice
Explanation:
<h3>FOLLOW THE STEPS : </h3>
1. 9th grade
2. develop a four - year academic plan.
3. take SAT subject tests and AP exams for relevant courses you are taking this year.
4. begin to identify activities outside of the classroom that you want to devote time to.
5. begin to explore College options.
Offers to mow his lawn, give him money, etc
