When I was given the choice between a surgery that could help me tremendously but would be a big adjustment. Personally, sorry if that isn't the answer you're looking for though.
Birthday is the subject of the sentence. This is because t<span>he subject of a sentence is the person, place, thing, or idea that is doing or being something.</span>
Its 50/50 animals are killed by humans for our benefits but they dont have to do it. We could simply eat vegetables or anything from plants (which i think anything that comes from plats is a vegetable). So I think that the answer depends on who is answering the question if they are vegans or meat eaters (which i am myself).