Trees take up carbon dioxide from the atmosphere and reduce to make carbohydrates. This is powered by the energy of the sun that is taped by chlorophyll pigments during photosynthesis. The energy is used to split water molecules into H+ and O2-. Then the following chemical reaction ensues;

6CO2 + 6H2O ------> C6H12O6 + 6O2

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Populations evolve for many reasons. Suppose there is a population of plants that have either purple flowers or white flowers, a

crimeas [40]

Answer:

n/l

Explanation:

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An intestinal hormone that stimulates parietal cells in the stomach is __________. secretin cholecystokinin enterokinase gastrin

Mariulka [41]

they are stimulated by gastrin

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