From the remarks just made we can see how by changes of structure in the young, in conformity with changed habits of life, together with inheritance at corresponding ages, animals might come to pass through stages of development, perfectly distinct from the primordial condition of their adult progenitors.
Arestian eginiko oharrei esker uler dezakegu zer dela eta irits daitezkeen animaliak, aztura-aldaketengatik kumearengan gertaturiko egitura-aldaketei esker, eta, horrekin batera, dagozkien adinetako herentziaren eraginez, beren gurasolehen helduen hasierako egoeratik zeharo diferenteak diren garapen-faseak iragatera.