Example sentences of "which has [verb] a [adj] effect " in BNC.

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1 Plants grown in different environments can be expected to vary and the biologist 's job is sometimes to identify the environmental change which has caused an observed effect .
2 This has led to farmers overstocking animals on the land which has had a devastating effect on birdlife .
3 They anticipated a number of significant developments which subsequently took place , like the setting up of a local authority for the Western Isles which has had a stimulating effect on the whole life of the area .
4 A second major influence which has had a dramatic effect in the second half of the century has been the educational approach .
5 A misrepresentation of history which has had a malignant effect on the affairs of Lewis and of crofting ever since .
6 There is , however , another and even more serious aspect of the closed mind which has had a profound effect on British archaeological thinking .
7 This is partly because the textiles and coverings have been treated with a sodium borate solution ( to increase their resistance to fire ) which has had an adverse effect on their appearance , and partly because most of the paintwork needs renewing .
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