basic

explosive

contention

subjected

generations

however

ignorant

indiscriminately

objected

people K. concern L. foundation M. supports N. investigation O. furthermore We are faced, according to Dr. Elton, “with a life-and-death need not just to find new technological means of suppressing this plant or that animal”; instead we need the ___1___knowledge of animal populations and their relations to their surroundings that will “promote an even balance and damp down the ___2___ power of outbreaks and new invasions.” It is not my ___3___ that chemical insecticides must never be used. I do contend that we have put poisonous and biologically potent chemicals ___4___ into the hands of persons largely or wholly __5___ of their potentials for harm. We have __6___ enormous numbers of people to contact with these poisons, without their consent and often without their knowledge. I contend, __7___, that we have allowed these chemicals to be used with little or no advance__8___ of their effect on soil, water, wildlife, and man himself. Future __9___are unlikely to forgive our lack of concern for the integrity of the natural world that __10___ all life.