☁️Answer☁️
The answer is A. Its organism one because if it got its energy from a biotic source, there would be an arrow pointing towards it.
Makana Here is a link to a good source for the bio homework XD http://cid.oxfordjournals.org/content/46/2/155.long <------ This is 1st source
http://www.medscape.com/viewarticle/808814 <------- 2nd source
(Ms. Zugs homework)
The answer is D I just took the test