Explain me, please, why "Animal fat was used in medicine." but not "Animal's fat was used in medicine."
Thank you in advance!
"Animal" is a noun modifier. In English nouns (singular form) can modify other nouns. This is a typical example.
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"Animal" is a noun modifier. In English nouns (singular form) can modify other nouns. This is a typical example.
Here is a good explanation. https://learnenglish.britishcouncil.org/en/english-grammar/adjectives/noun-modifiers