By saying "they employ chemical warfare" (Para. 2), Bruce Ames means ______ .A.plants abso
By saying "they employ chemical warfare" (Para. 2), Bruce Ames means ______ .
A.plants absorb useful chemicals to promote their growth
B.plants produce certain chemicals to combat pests and diseases
C.farmers use chemicals to protect plants against pests and diseases
D.farmers use man-made chemicals to dissolve the natural chemicals in plants