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Chlorine, bromine and iodine.

Peristalsis describes the movement of food throughout the digestive system. Muscles in within the gut wall contract therefore pushing the bolous of food through the digestive system.

The movement of a substance from an area of high concentration to an area of lower concentration. One of the ways a substance can move in and out of a cell across the cell membrane.

firstly we know how fast the wave is travelling and we know for how long so using our speed equals distance over time equation we can rearange for distance (D= VT). we can the plug in our speed(V) and our ti...

firstly the largest power is x^2 so when factorising we know that both brackets must involve an x plus or minus a number. next we look at the 21 and we need two numbers that multiply together to get this num...