Organs now of trifling importance have probably in some cases been of high importance to an early progenitor, and, after having been slowly perfected at a former period, have been transmitted to existing species in nearly the same state, although now of very slight use;
Egun garrantzi kaskarra duten organoak seguraski garrantzi handikoak izan dira urruneko arbasoren batengan, eta antzinako aldiren batean astiro-astiro hobetu ondoren, ia egoera berean transmititu zaizkie egungo espezieei, nahiz eta gaur emendio handirik egin ez;