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  • Close up of some Earthworms in soil.
    Rights: The University of Waikato Published 18 June 2008 Size: 250 KB Referencing Hub media

    Earthworms help break down organic matter into soil and are an important indicator of the health of the soil. They can also be used directly as a ‘tool’ to determine if certain toxins are present, by measuring the timing of their response to a touch.

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