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Active transport is when molecules cross the cell membranes by moving from low concentration to high concentration ____ energy input .
Explain why using tradition to solve the distribution aspect of the economic problem (e.g., reciprocity) faces limitations when society reaches a certain size and hence needs to be supplemented with other solutions.
28. A solution is diluted by removing half the amount and then adding solvent to return the solution to its original volume. This process is repeated two more times. What fraction of the original concentration is the concentration of the final solution after the third dilution?
