"carry on a particular activity" just means to do that activity. "in" is a preposition and "which" is a relative pronoun. When a relative clause modifies a noun that is logcially the object of a preposition, the preposition can be moved before "which": I live in the city -> the city in which I live I work at a restaurant -> the restaurant at which I work I escaped from prison -> the prison from which I escaped etc.
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Mickey Mouse 8241Could you please tell me how the following senetnce would be if we use preposition as the object of the preposition?A preposition cannot be the object of a preposition. It may be that you meant to write "noun as the object of the preposition". If so, I have already shown this when I wrote:
GPYIt may be that you meant to write "noun as the object of the preposition". If so, I have already shown this when I wrote:Sorry. Yes. That was what I meant and I made a mistake.
GPYPeople carry on a particular activity in certain conditions and influences. These conditions and influences are called "environment".Great.