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Layers of the atmosphere. The atmosphere is comprised of layers based on temperature. These layers are the troposphere, stratosphere, mesosphere and thermosphere. A further region at about 500 km above the Earth's surface is called the exosphere.
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A common birth defect that is usually due to an extra chromosome 21( trisomy 21) .
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I'm sure it's none of the above. The planting method where seeds are placed on top of a peak is called Hand Sowing.
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The two stages of photosynthesis: Photosynthesis takes place in two stages: light-dependent reactions and the Calvin cycle (light-independent reactions). Light-dependent reactions, which take place in the thylakoid membrane, use light energy to make ATP and NADPH