What doesn't protect plants?
viruses smallpox herbicide steroids A virus Nematoda chickenpox cigarettes
A B C D E F G H
Plants are poisoned by herbicides, animals by pesticides.
an herbicide poisons plants
What doesn't protect plants? (A) viruses (B) smallpox (C) herbicide (D) steroids (E) A virus (F) Nematoda (G) chickenpox (H) cigarettes