When did margaret thatcher became prime minister?

Margaret Thatcher became Prime Minister of the United Kingdom on 4 May 1979 and served until 28 November 1990.

Explanation:

tearing down the berlin wall.

in contrast, the biological controls are self-sustaining, inexpensive and very effective once established. biological control could be used on thousands of golf course acres, improving their biodiversity and quality as wildlife habitat. in the process, the golf industry will be shown to be leaders in an environmental stewardship program of benefit not only to the lands they manage but also to the watersheds in which they exist.