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- Transmit diseases;
- Feed on whole or parts of plants;
- Injure plants providing entry for secondary infection agents;
- Suck blood from animals causing anemia;
- Act on plant and animal remains to form humus;
- Some cause diseases;
- Some kill and feed other animals;
- Some bring out cross pollination;
- Some fix nitrogen into the soil;
- Increases cost of product through control measures;
lemass answered the question on January 15, 2019 at 19:52
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