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Industrialisation and modern methods of insect control have [#permalink]
15 Jul 2006, 08:41
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Industrialisation and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced 10000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago.
a) while at the same time they have introduced 10000 chemical pollutants ,having
b)while at the same time introducing some 10000 dangerous chemical pollutants that have
c) while they have introduced some 100000 dangerous chemical pollutants at the same time , which have
d) but introducing some 10000 dangerous chemical pollutants at the same time that have