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pollution
they eat unwanted insects
In mining, tailings are the unwanted byproduct that affects the environment. But with the separation process called GravSep, acid forming mineral content of the tailings is reduced. The result: cleaner tailings. Mining usually produces byproducts, called tailings, that are harmful to the environment. But with the physical separation process, which is GravSep, harmful substances in the tailings are significantly reduced.
By eating unwanted weeds and fertilising with their manure.
No If you count pollution as unwanted chemicals or material in an environment.
Pollution come from unwanted waste that gets into the environment.
Left-overs, scraps, extra, uneaten, remnants, excess, unwanted
an unwanted change in the environment caused by substances or forms of energy
No, the pump spray is better. It does not put unwanted gases into the atmosphere.
sequelae
peremptory challenge