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Biological control involves the introduction of ( living, deceased, large ) organisms into an area affected by ( drought, pests, humidity ). The biological controls ( attack and eat, feed and provide food for, ignore ) the pests, eradicating the issue from the area. However, if too successful, these controls can ( eliminate, increase, support ) the food supplies of native species. They may also attack the native species. If proper research is not carried out prior to their introduction, they may prove to be ( ineffective, colourful, effective ) or a ( pest, organism, crop ) themselves.