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Message: <blockquote data-quote="Son of the Serpent" data-source="post: 7890817" data-attributes="member: 7015476">Please dont ever be a biologist or a doctor.It is nowhere near that black and white.  There are in fact organisms thay do not "grow" throught their lives and they are some of the most successful.They are generally very basic.  But to say none of them are (in a way) advanced or evolved would be incorrect.Case in point.  There is a prion (for which very recently the following is held to almost definitely be true) that once in the VERY distant evolutionary past was highly communicable (some evidence says that in extreme scenarios it still is but that requires organ transplants.  Very not the norm for it any more) and now only reproduces inside of specific groups of host species.  Never venturing outside its environment.  But having astoundingly high success at reproducing itself.  It is the prion that causes alzheimer's disease believe it or not.  It reproduces in two modes.  One involves replication during the life of an individual host body and the other by having embeded genes in the host species to ensure it will continue living in the guilded cage it has planted itself in via those genes building a critical mass of it throughout an affected organism's life while also being able to spread throught the species via the host species manner of genetic recombination and reproduction cycle (conception).  It has spread throughout a vast percentage of multiple species by living in the guilded cage of our genes and bodies.  It paracitizes species as if a whole species and not just the individual is a host as it has hijacked our genes in a manner that allows it to be seeded in new individuals a percentage of the time whenever our genes combine to create a zygote.  Very impressive.  Furthermore its nearly impossible to destroy the molecule (yes.  Its a single molecule life form.  Some biologists accept this as the most basic form of life rather than a virus.  Self replicating biological protein with a basic genetic blueprint) that causes a prion disease by means that wont kill the host.  Furthermore this organism (the particular prion that causes alzheimer's) likely hasnt changed for eons.  It has become a genetic disease that produces pathogenic affect within an individual as once it is produced by the body it then starts converting normal proteins into copies of itself.  And it has hardly ever changed recently.  Hardly evolved.  It went from a pathogenic disease to a disease that essentially has a genetic boot process and a primarily pathogenic replication process after a critical point in many ways.Another example of a more conplex lifeform that has done something similar (albeit to the benefit of creature hosting it)is the bacterium that became the mitochondria by joining its genetic reproductive cycle with our own cellular biology (and that of many other creatures).These things have a large cage to live in but its rather specific and they do not step outside of it.Fuethermore habitat range not expanding when a creature could easily do so is a well documented defense for higher more complex organisms to avoid disease, starvation, and unhealthy breeding patterns for certain creatures.</blockquote>

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