Animal Behavior College (ABC) Externship Practice Test

The term tissue origin is what this question tests. The combining form sarc/o comes from Greek sarx meaning flesh, so it carries the sense of flesh or flesh-like in medical terms. It’s used in words like sarcoid (flesh-like) and sarcoma (a malignant tumor of flesh tissue). The other options relate to different things: scler/o means hard, ren/o is kidney, rhin/o is nose. So the best choice for flesh-like is the combining form sarc/o.