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During prophase chromatin condenses and supercoils, and so the chromosomes become visible. The nuclear envelope breaks down and the centrioles migrate to opposite poles of the cell and start to produce th...

'La mayoría de la población hispánica habla español, pero no todos.'

As his hand moves back with the ball, the time taken to stop the ball is greater. This means that the rate of change of momentum is less (because the rate of him changing the speed of the ball is much slo...

An impermeable membrane is one through which no substance can pass. Semipermeable membranes are those which only let solvents, such as water, pass through them. Permeable membranes are those which let sol...

To understand how water is reabsorbed in the loop of Henle, it helps to first consider what happens in the ascending limb. The ascending limb is permeable to ions but impermeable to water. Ions are pumped...