Metamorphism is the addition of heat and/or pressure to existing rocks, which causes them to change physically and/or chemically so that they become a new rock. Metamorphic rocks may change so much that they may not resemble the original rock.
Its called the Photosphere, which is the part that we can see.
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Insulin is the key hormone of carbohydrate metabolism, it also influences the metabolism of fat and proteins. It lowers blood glucose by increasing glucose transport in muscle and adipose tissue and stimulates the synthesis of glycogen, fat, and protein.
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Aid can increase the dependency of LEDCs on donor countries. Sometimes aid is not a gift, but a loan, and poor countries may struggle to repay.
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