That organism,
called a symbiont, gets protection from the environment and, in return, sometimes offers some benefit.
A species that lives this way, offering substantial help to the other species, is sometimes
called a symbiont.
Not exact matches
While exploring the genome of a louse
symbiont, they encountered an extrachromosomal region
called a plasmid.
When this happens, one might expect that if the host organism evolves into two species, its
symbiont would follow suit — a process
called «cospeciation» or «congruent evolution.»