Posted by casey on Sunday, August 30, 2009 at 2:53pm.
Water comprises most of our mass too.
Carbon dioxide is one atom of carbon linked to two atoms of oxygen ("di-" means "two").
It is absorbed by plants and exhaled by animals.
I hope this helps. Thanks for asking.
Consider the molecular formula for glucose (other building blocks, such as other sugars, cellulose, and starches are similar ratios)
C6H12O6
Notice there are 6H2O, and 6C
The water is about 1.5 massive as C. So most of the mass comes from water. Other molecules in plants have a similar ratio.
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