by 
Thomsa
ANSWERS: 3
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Algae
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Hmm, I don't know the exact answer for your question as all I can find is an article listing sugarcane as very efficient. http://www.life.uiuc.edu/govindjee/whatisit.htm
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You probably trample over grass and shrubbery without giving thought to the fact that our very life depends on these green plants. the Encyclopedia Americana claims that “grass is the most important of all plants to man.” Botanist Lauren Brown further states: “Of the 15 major crops that stand between us and starvation, 10 are grasses.” The lowly grass, the majestic oaks and sequoias, even the modest plant decorating your table, do more than just beautify. They feed and clothe us. They purify the air we breathe. They are vital to our survival. My answer is grass.
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