the embryo often retaining, while within the egg or womb, structures which are of no service to it, either at that or at a later period of life; on the other hand, larvae which have to provide for their own wants, being perfectly adapted to the surrounding conditions;
enbrioiak, arrautza barruan edo umetokian dagoen bitartean, ezertarako, ez oraingo bizitzaldirako ez gerorako, balio ez dioten egiturei eustea maiz, eta larba, ostera, bere premiei erantzun beharragatik ezin hobeto egokiturik egotea inguruneko baldintzetara;