solar power, The natural energy that comes from the sun and can be used to produce electricity.The number of babies that are born in a population over a certain period of time., birth rate, The number of babies that are born in a population over a certain period of time., run out of, To use all of something so that none is left., affect, To influence or change something or someone., cure, A medical treatment that makes a disease go away., cells, The basic units that make up all living things., cause, To make something happen; to be the reason something happens., fall steadily, To decrease slowly and continuously over time., dramatically, Very quickly and in a noticeable way., genes, Parts of the body’s DNA that decide how people look and develop..

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