Write a definition of a prime number

A prime number is a number greater than 1 with only two factor which is 1 and themselves. A prime number cannot be divided by any other number without leaving a remainder.

water molecules will move from the side of higher water concentration to the side of lower concentration until both solutions are isotonic. at this point, equilibrium is reached. in an isotonic solution, the flow of water in and out of the cell is happening at the same rate.

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