The left ventricle works harder than the right ventricle because it has to .

A.
squeeze carbon dioxide from the blood
B.
send the blood to both lungs
C.
push the blood through the whole body
D.
push the blood back into the heart

b brown mice / white sand dunes

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oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%