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).
Two times you would need to include more information are if your citations include two or more authors with the same last name and if your citations two or more texts by the same author.
A—
This sentence pretty much sums up what the writer of the passage wants to talk about. The other ones do not fit with the sentence “water is one factor that is necessary for growth” and do not fit the idea of the passage, which is what factors affect plant growth.
Many customers said they had a chance to eat and drink in a cleaner environment.
