Q.No:4 Answer in brief
What does human life depend on
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Human life depends on air, water and food (in the primary level); and cloth and shelter (in the secondary level). Air is needed for respiration as well as circulation which are the important mechanism of the living organism.
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People depend on plants for food, clean air, water, fuel, clothing, and shelter. Nearly all food webs begin with plants, the primary producers. During photosynthesis, green plants use sunlight to change carbon dioxide from the air and water into simple sugars made of carbon, hydrogen, and oxygen.
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