Herbivores depend on plants for food. Carnivores depend on herbivores. Omnivores depend on both plants and animals. Plants depend on decomposed animals and plants for food
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The one that Carbon footprint measures is : Greenhouse Gasses
Carbon Footprints are the Carbon Compounds emitted due to consumption of fossil fuels (such as gas oil) that could cause Greenhhouse effects
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Process of photosynthesis makes glucose. Excess glucose is stored as starch, or made into cellulose in cell walls.