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| Cells use nutrients from foods for energy, growth, repair, and regulation. |
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| In autotrophic nutrition, the organism can synthesize organic molecules from inorganic substances obtained from the environment. The most common type of autotrophic nutrition is photosynthesis. |
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| organisms that carry out photosynthesis are called autotrophs.A group that includes all plants, all algae, and some bacteria. |
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| Photosynthetic organisms use carbon dioxide and water taken from the environment,along with energy from sunlight, to synthesize the organic compound glucose. |
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| Photosynthesis requires the presence of certain colored molecules called pigments, which asborb light energy and convert it to a form of chemical energy that can be used by living things. |
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| Chlorophylls are the green pigments found in photosynthetic organisms. Chlorophyll is unable to absorb the green wave lengths of light. That is why plants appear green; chlorophyll reflects the green light. |
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| In most of these organisms, the chlorophyll is found in organelles called chloroplasts. |
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| Within the chloroplasts, the pigments are located inside sacs called thylakoids, which form many stacks, or grana. |
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