The chemical energy used by most organisms for metabolism and growth ultimately comes from The sun.
The sun provides energy to the majority of living things. Herbivores obtain energy from eating plants, which they do by using photosynthesis to absorb sunlight.Plants use the chloroplast to convert light energy into chemical energy, which is then stored in glucose. Water and CO2 enter the chloroplast, where light energy breaks up molecules before scattering them.
Carnivores consume herbivores, and eventually, plant and animal matter decomposes, adding nutrients to the nutrient pool. Chemical reactions take place in steps to produce and break down complex molecules as part of cellular activities through metabolism. While some of these chemical processes take energy to complete, others happen spontaneously and release energy.
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