Biology: saprophyte
Tutoring biology, terms are important. The tutor mentions saprophyte.
In biology, a saprophyte is an organism that feeds on nonliving organic matter. For instance, mold on bread is acting as a saprophyte.
Source:
Ritter, B., Coombs, R.F., Dyrsdale, Dr. R. B., Gardner, Dr. G.A., Lunn, D.T. (1996). Biology (British Columbia Edition). Nelson Canada.
Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.