Walkers can unwittingly damage the fragile environment _________.
that the birds live
where the birds live in
which live the birds
in which the birds live
Correct Answer: EASY
WHICH: is a relative pronoun that indicates a thing, after a noun of a thing to act as the subject or object of the verb after it: ….N (thing) + WHICH + V + O / ….N (thing) + WHICH + S + DRAW
THAT is a relative pronoun for both people and things, which can be used instead of who, whom, and which in defining relative clauses.
WHERE (= in/on/at which): replaces place words
….N (place) + WHERE + S + V ….
Pedestrians can inadvertently destroy the fragile environment in which birds live.