Answer:
4
Explanation:
Your heart and arteries are working way to hard when obesity and poor diet are factors
Talk with your family and friends and try to look at the positive part of the life because there is a lot to do in life
The blood brings oxygen to the body cells<span> and takes away their carbon dioxide. The blood that travels </span>back<span> to the </span>heart<span> and </span>lungs<span> is </span>dark red<span>. It has picked up carbon dioxide from the </span>body cells<span>, and it has left most of its oxygen with the cells.
</span><span>http://lsa.colorado.edu/essence/texts/lungs.html
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