Question:
The construction company could not rezone the area due to endangered butterflies because they are in danger of being wiped out if their environment is ruined.

Who is they referring to in this sentence?
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Answer:
endangered butterflies


Question:
A motorboat turns the propeller pushing the water backwards, thus it moves forward.

Who is it referring to in this sentence?
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Answer:
A motorboat


Question:
Hitler conquered Alex in the war because nobody supported him.

Who is him referring to in this sentence?
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Answer:
Alex


Question:
The orchestra was booed by the audience because they had performed poorly.

Who is they referring to in this sentence?
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Answer:

The orchestra