Q: Roundworms can be free-living or live on a what?\nOptions:\n- (A) soil\n- (B) nest\n- (C) host\n- (D) root\n- (E) stem\n- (F) habitat\n- (G) food\n- (H) commune
Let's think step by step below.

User
Roundworms may be free-living or parasitic. Parasites Shortfin makos host a variety of parasitic copepods. Roundworms may be living on a host or free-living.
Thus, the answer is (C).
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