Question 1
The prefix ex- means "out of" or "out from," as in expel. Before certain consonants, it shortens to e-, as in evoke. What does ex-/e- mean?
"ex-" means "out of." Before certain consonants it shortens to "e-." In expel, something is pushed out. In evoke, "e-" (from "ex-") draws out a feeling or memory.