In many cases, introduced earthworms find a perfect environment, because no other organisms have been able to use the resources that these earthworms now consume. For example, in northern North America, earthworms have been absent for more than 10,000 years and have only been re-introduced over the past ~400 years. Some regions of the world have developed without earthworms for over thousands of years. This is because other organisms need to be used to the activities of earthworms to benefit from their presence. However, in some cases, earthworms have more negative effects. We all know earthworms as important friends in our garden: they help plants to grow better by providing nutrients, water, and air in the soil.
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