This small worm is 1mm long and lives for around 2-3 weeks. C.elegans are useful to research because they are some of the most primitive forms of life that share some of the systems and cycles that humans possess.
Caenorhabditis elegans is a transparent nematode worm used as a model organism in developmental biology. the worm is composed of 959 cells in the adult hermaphrodite form and 1031 in the adult male. The organism is also frequently used to investigate neural development and function as it is one of the simplest organisms with a nervous system. The fate of each cell in the organism has also been mapped, and is almost invariant between organisms due to being based on lineage rather than cell cues.