Hi Mitali, The common usage is that nouns used as adjectives are singular, so that it is 'shoe store', 'chemical industry', 'life science division'. However, local usage would supersede this guideline; that is, the company or institution may have its own preferred terminology. For instance, many universities term the field 'life sciences' (botany, zoology, ecology, etc) and may use the phrase 'life sciences faculty'.
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