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Blood enters the atria. It cannot pass into the ventricles because the atrioventricular valves are closed. The heart is in diastole.The atria contract. The pressure in the atria becomes greater than the p...

Do 2x -2 = -4List these factors Choose two of those factors which equal to -3x, in this case 1 and -4 (or the other way around)Rewrite the equation as 2x² + x - 4x -2, then factorise this in tw...

Leaves have a large surface area, which means more space to allow CO2 to enter. They are thin so there is less for gases to travel. Leaves contain Stomata; these are small holes found distributed througho...

Anaeobic respiration in yeast:
glucose -> carbon dioxide + ethanol

Anaerobic respiration in muscle cells:
glucose -> lactic acid

The lactic acid build up in muscles r...

Quotations from the text(s) that you are analysing are, obviously, essential to an essay. If you have too few the essay will feel vague and unsubstantiated - too many, and the flow of the essay will come ...