Assignment: was the earth ever really flat? exploration scientist date of theory view of arrangement of the universe ptolemy copernicus kepler galileo newton me, i need to turn in my assignment. i need this asap

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many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

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the sun creates it's own light, also gives light and life to bunch of stuff like plants,animals,humans etc.photosyntesis is the process of making food which needs sun,water,nutrients etc.