. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . E FIG. 136.—Later stages in the development of the prawn, Peneus potimirium : D, Mysis stage; E, adult stage. differences which among the living backboned animals arefamiliar to all of us. The course of development of an in-dividual animal is believed to be a very rapid and evidentlymuch condensed and changed recapitulation of the historywhich the species or kind of animal to which the developing in-dividual belongs has passed through in the course of its
. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . E FIG. 136.—Later stages in the development of the prawn, Peneus potimirium : D, Mysis stage; E, adult stage. differences which among the living backboned animals arefamiliar to all of us. The course of development of an in-dividual animal is believed to be a very rapid and evidentlymuch condensed and changed recapitulation of the historywhich the species or kind of animal to which the developing in-dividual belongs has passed through in the course of its descentthrough a long series of gradually changing ancestors. If this istrue, then we can readily understand why a fish and a salaman-der, a tortoise, a bird and a rabbit, are all much alike, as theyreally are, in their earlier stages of development, and graduallycome to differ more and more as they pass through later andlater developmental stages. A crab has a tail in one of its 234 EVOLUTION AND ANIMAL LIFE developmental stages, so that at that time it looks like andreally is like the mature stage of some tailed crustacean likea
Size: 2214px × 1129px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorkelloggvernonlvernonl, bookcentury1900, bookdecade1900
