A past participle is a form of verbs that, if formed regularly, has the form of "stem+ed".
The past participle of "tangle" is "tangled" and the sentence with the past participle is:
I stepped into the middle of the tangled vines.
(actually the last sentence also has a past participle in it, but not only, so I am not choosing it).
Answer:
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Because camels backs are lumpy