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Rights: Sara L Roggemann, Three Flowers Photography Published 12 June 2012, Updated 23 March 2017 Size: 36 KB

The earthworm’s ‘brain’. Earthworms have a simple nervous system. The cerebral ganglion is connected to a ventral nerve cord that runs the length of the body. Each segment is connected to this cord, allowing earthworms to move and respond to light, touch, chemicals, vibrations and more.

Acknowledgement: Sara L Roggemann, Three Flowers Photography