What cannot reproduce by itself?
Acids all plants anemia smallpox cigarettes all corals all bacteria acetic acid
A B C D E F G H
Some smallpox viruses are maintained in laboratories.
smallpox cannot reproduce by itself
What cannot reproduce by itself? (A) Acids (B) all plants (C) anemia (D) smallpox (E) cigarettes (F) all corals (G) all bacteria (H) acetic acid