Yes it is okay as long as you give credit to that person
I am pretty sure the answer is D the bare oak tree because it is mentioned in both passages given
Depending on what grade you are, maybe. If you are in sixth grade or lower, yes. In seventh and higher, no. A question as a hook is taught in elementary school but should not be used in higher grade essays.
There are a few words that could work here, but a common one is "respectable". If something or someone is respectable they are worthy of attention. There are other words as well.
An adjective clause is a type of clause that also contains a subject and a verb, but functions to describe a noun. This clause is often introduced by pronouns such as whom, who, that, which and the adverb where, when and why. In the given sentence above, the adjective clause is, "who received a good grade". This clause describes the noun "student".
