. Beginners' Zoology . ?Water Fic. 2. —A Leaf storingEnergy in Sunlight. THE PRINCIPLES OF BIOLOGY 3 into organic substances. The oxygen of the carbon dioxideis set free and returns to the air (Fig. 2). Starch, sugar,oil, and woody libre are examples of substances thusformed. Can you think of any fuel not due to plants .?How Animals obtain Energy. — You have noticed thatstarch, oil, etc., will burn, or oxidize, that is, iinite tvith theoxygoi of tJie air; thus the suns energy, stored in thesesubstances, is changed back to heat and motion. Theoxidation of oil or sugar may occur in a furnace; it
. Beginners' Zoology . ?Water Fic. 2. —A Leaf storingEnergy in Sunlight. THE PRINCIPLES OF BIOLOGY 3 into organic substances. The oxygen of the carbon dioxideis set free and returns to the air (Fig. 2). Starch, sugar,oil, and woody libre are examples of substances thusformed. Can you think of any fuel not due to plants .?How Animals obtain Energy. — You have noticed thatstarch, oil, etc., will burn, or oxidize, that is, iinite tvith theoxygoi of tJie air; thus the suns energy, stored in thesesubstances, is changed back to heat and motion. Theoxidation of oil or sugar may occur in a furnace; it mayalso occur in the liviner substance of the active
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