Question

the cow lives -----Grass.(fill in the blank with oppropriate preposition)

Answer 1

the cow lives on grass .
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Answer 2

Answer:

The cow lives on grass.

Explanation:

A preposition is a function that is linked to the pronouns, nouns. Prepositions are used in ‘phrasal verbs’. Prepositions are information to any ‘noun or verb’ and signify various ‘relationships’ such as time, location, and position.  

Here in this sentence, 'on' has been used. The sentence implies that cows survive upon grass. They eat only grass to live. Thus on is the correct preposition that has been used.