A nematode (Caenorhabditis elegans) that lives in soil, feeds on bacteria, and reaches lengths of about 1 mm (0.04 inch). It was the first animal whose genome was completely sequenced, and is widely used as a model organism by researchers in genetics and developmental biology because it has a small genome and transparent skin.
File:Caenorhabditis elegans hermaphrodite adult-en.svg – Wikipedia
An Overview of the Model Organism: C. Elegans | Society for Mucosal
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