Which sentence uses who correctly?

from who did you receive the call?
who did you call?
who is the person that i should call?
to who are you speaking?

Read these passages from when birds get flu and cows go mad by john

According to stephen hawking in the "origin of the universe" lecture, "why are we here" and "where did we come from" are questions that

In which sentence does the underlined adverb modify a verb? (i’ll put the words that are underlined in caps) a. water young plants often. b. water young plants rather often. c. we generally water young plants often. d. water very young plants often.