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InstructionsRead the text below. Some of the lines contain an extra, incorrect word. If there is an extra, incorrect word in a line type the word in the box on the right. If the line is correct, type 'OK'. For example:0 when00 OK
0 In times of trouble when snails have the perfect escape00 but retreating into a shell does not always guarantee1 a survival. For the land snail Arianta arbustorum,2 faced with local climatic warming in the Swiss city3 of Basle, having had a shell has not helped a bit.4 Between 1903 and 1991 this snail became really extinct5 at 16 out of 29 localities around the city. All eight6 populations were killed off by urban development but7 the other eight sites continue on to support healthy8 populations of these other mollusc species. Snail9 experts at Basle University checked on the differences10 between the sites where the snails all live and those from11 which they had been disappeared. The only difference12 was ground temperature. Built-up districts which emit13 more heat, and in otherwise perfectly suitable habitats14 Arianta had died out at sites that were quite artificially15 warmer. The difference was often just a few warm degrees.16 Small as this very difference was, its effect was huge.
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