How does the protagonist change as the story progresses in the story of "the metamorphosis"

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How does the protagonist change as the story progresses in the story of "the metamorphosis"?

Gregor turns from a human to an insect, but unlike the other characters, his inner essence remains unchanged. When he initially finds he's changed, he doesn't express much emotion, instead accepting the fact that he's turned into a bug and attempting to live his life as best he can in a new body.

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