Sodium and potassium need to be pumped and not just travel by passive or facilitated diffusion because the cell is concentrating sodium and ridding itself of potassium.

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Nasa scientists must work together to make sure that everything is correct and accounted for when launching a shuttle. besides a physicist, what other type of scientist would be in making sure that the shuttle has the appropriate type and amount of fuel to reach its destination?

What sre the effects of hemolytic disease of a newborn

Which direction does the energy flow in this energy pyramid ?