but, on our view, this part has undergone, since the several species branched off from a common progenitor, an unusual amount of variability and modification, and therefore we might expect the part generally to be still variable.
baina, gure teoriaren arabera, atal honek, espezie ezberdinak arbaso komunarengandik abartu zirenetik, ezohiko aldagarritasun eta eraldaketa jasan du, eta horregatik espero genezake atal hori oraindik aldagarria izatea.