Stacks of thylakoids in a chloroplast are called

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Granum

Explanation:

They contain the photosynthetic pigments and the enzymes for the light reactions of photosynthesis. The chlorophyll in the grana traps light in form of photons. some of the light is used in photochemical splitting of water.

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answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.