what sustains life on earth
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what sustains life on earth
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what sustains life on earth, how the earth sustains life, what three factors sustain life on earth, what 3 things sustain life on earth, what is life on earth, sustaining life on earth, what things make life on earth possible, what two things support life on earth, characteristics of life on earth, facts about life on earth, what sustains human life, what makes life on the earth possible, elements of life on earth, types of life on earth, earth characteristics that support life, properties of life on earth, life on planet earth, how does earth have life