Antibiotics enter the environment in wastewater from pharmaceutical manufacturing plants, in wastes from  farms where they are used in animals, and in sewage from human populations. (Many antibiotics are excreted  in their active form.) The influx of antibiotics into the environment is a concern because the presence of these  compounds in the environment selects for antibiotic resistance. As pollutants, antibiotics can also have ecological effects. Describe some of the ecological roles of  bacteria, and explain why disruption of these roles by antibiotic pollution would have a negative impact.

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Environmental effects

Environmental effect is the beneficial or adverse impact of human products, services, or activities on the environment. For example, the release of volatile organic compounds negatively affects the environment and causes smog formation. On the other hand, collecting litter and putting it in bins positively affects the environment.