2. Wherever clauses can be followed by possibilities.
The verb is a bit tricky. If the two words connected by "and" are so closely related as to compose a set, the singular verb is acceptable. Things like "bread and butter", "salt and pepper", etc. In this case, "water and air" is a close call. I would probably use a plural verb.
3. No. One can use "incline" as an active voice verb, but the circumstances do the inclining.
The facts incline me to sign the bill.
I am inclined to sign the bill.
Student or Learner