A. continue to control pests for many years
B. leach out of the ground quickly
C. are harmless to humans
D. can be toxic to other forms of life
(Sponsored by Sir Tauqeer)
(Sponsored by Sir Tauqeer)
(Sponsored by Sir Tauqeer)
(Sponsored by Sir Tauqeer)
(Sponsored by Sir Tauqeer)
(Sponsored by Sir Tauqeer)
