Ascientific term that describes watching and studying attentively is

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.

d.embryo is the correct one

answer; /// the shaft of the hair consists of dead cells;