Some what will kill their host, while others won't?
barnacles producers scavengers insects cigarettes fungi plants leeches
A B C D E F G H
Leeches are external parasites.
Some leeches will kill their host, but most do not.
Some what will kill their host, while others won't? (A) barnacles (B) producers (C) scavengers (D) insects (E) cigarettes (F) fungi (G) plants (H) leeches