posterior root the posterior, or sensory, division of each spinal nerve, attached centrally to the spinal cord and joining peripherally with the anterior root to form the nerve before it emerges from the intervertebral foramen; each posterior root bears a spinal ganglion that conveys sensory fibers to the spinal cord.he sensory division of each spinal nerve, attached centrally to the spinal cord and joining peripherally with the ventral root to form the nerve before it emerges from the intervertebral foramen.
Bettas on average live little more than two years, while Goldfish live for decades. Short Lifespans. Killifish are among the aquarium fish with the shortest lifespan. They generally only live a year or two. Bettas are not far behind, averaging only about 2 years. There have been documented cases of Bettas living 5 years or more, but that is not the norm. Livebearing fish such as Mollies, Platy s, and Swordtails, generally live less than 5 years. Long Lifepsans. On the other end of the lifespan spectrum, are Goldfish.
Life spans are how long the life of an animal can live. 1st Example: A goldfish has a lifespan of 2-5 years. 2nd Example: The life span of a butterfly is 1-2 years A life â¦ span is the average lenght of time any living thing usually lives, including us.