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).
Depending on what kind of sentence it is .
Sentence three is the correct sentence. All of the others have some grammatical error in them. In the first, "felled" is incorrect and not a word. It also says "walk boots" instead of the correct verbal adjective "walking boots." In the second, "weren't" is not usually considered very academic and "tight" should be in the adverb form "tightly." Number four is wrong because it used "walked boots" instead of of "walking boots" and "tight" instead of "tightly." "Fallen" is incorrect in number 4, because it should have been "had fallen" if one was going to use the verb "fallen."
Answer: B
Explanation: If you are researching Australian plants and animals, you would go to resources that circle around Australian based information. Anywhere else would not be accurate.
The most obvious fault of this paragraph is the lack of punctuation marks. The entire paragraph is one sentence, when there are supposed to be periods, commas, and other punctuation marks to separate them. This makes this paragraph one run-on sentence, which is grammatically incorrect.