The original source of energy in most ecosystems is a) water. b) the sun. c) carbon in the carbon cycle. d) the products of photosynthesis.

i believe your answer would be c.. : )

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.