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list a few

2007-01-23 13:04:10 · 1 answers · asked by siresquelator 1 in Science & Mathematics Botany

1 answers

1. ultraviolet light
2. asbestos
3. chemicals in cigarette smoke
4. other chemicals in agriculture or industry

2007-01-23 13:07:43 · answer #1 · answered by ecolink 7 · 0 0

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