... shaped. The hollow hairs covering the leaves sit on a 'pore' which is filled with an acid. When a human brushes past the leaves, the hairs break off allowing the release of the acid onto the skin. This irritates the skin causing white itchy spots to appear. Common habitats for nettles are hedgerows, soil heaps, riverbanks and shaded land. The leaves contain high levels of magnesium, iron, nitrogen and calcium. Variables: The independent variable will be the type of grassland (grazed or ungrazed). The dependant variable will be the number of stingers on the nettle leaf (per cm2). I will collect 10 leaves from each area I want to examine. The difference between the areas is that one will have been subjected to animal grazing and the other, undisturbed for a long space of time. Collecting 10 samples from each plant will obtain a large sample to make my results more accurate and reliable. Fair ...

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