Telephone numbers in Singapore digits. Five digits were introduced in 1960s, whereas 5-digit and 6-digit phone numbers were introduced in 1960s as fixed lines grew, but in that year, these changed to seven digits as the introduction of new towns arose (Tampines, Jurong East, Bukit Batok, Yishun and Hougang) and a large number of new numbers were required. Rationalisation was based on geographical locale over the 12 years. In 1995, the digit '9' was added to the front of mobiland pager numbers, making numbers eight digits, and on 1 March 2002, the digit '6' was added to the front of existing fixed line telephone
Introduced species of the British Isles displace native species. This can occur by predation, competition for resources, or the spread of disease. Predation: American mink "(Neovison vison)", which either escaped or were released from fur farms, prey on native European water voles "(Arvicola amphibius)" and are drastically reducing their numbers. It was reported that since the late 1980s, 90% of the UK population of the European water vole has been lost, primarily due to displacement and predation by the American mink. Resource competition: The introduced grey squirrel is larger and more aggressive than the native red squirrel "(Sciurus vulgaris)" and displaces the native squirrel by competing