Answer:
The heart is pumping more blood throughout your body
Explanation:
This is a really hard question. Because if you change it to 1,000 then that's only one. If you add the decimal so it's 1,000. , then that's 4 if you change it to 1,040, that's 3. So you can not change that to 2 significant digits.
The answer that I got was - 12702 hydrogen atoms!
I hope this helped.