TASK DEFINITION: In this task, you are given a sentence. You must judge whether a single noun or verb has been replaced with another word with the same part of speech. The inversion would result in the sentence sounding unnatural, So unnatural sentences will be considered changed. Label the instances as "Original" or "Changed" based on your judgment.
PROBLEM: I wandered about the city as I disguised my days away and at night I tried to learn what would await me at the Arch .

SOLUTION: Changed

PROBLEM: Except for the slices on her wrists and the bloodstains , her body was flawless .

SOLUTION: Original

PROBLEM: Species have the ability to adapt over time to counter new threats .

SOLUTION:
Original