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Several billion years ago which gas was the least prevailant in the atmosphere
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This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient
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Molecules like glucose and amino acids are not lipid soluble, so cannot cross the cell membrane by simple diffusion. instead, they are shuttled across by carrier proteins in the membrane from high to low concentration. does this process require energy from the cell? this is an example of what type of molecular movement?
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What is the example of organizational dilemma ang give the solution...
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