Vestigial Structure
Vestigial Structure:
deff: A rudimentary or degenerate, usually non functioning, structure that is the remnant of an organ or part that was fully developed or functioning in a preceding generation or an earlier stage of development.
deff: A rudimentary or degenerate, usually non functioning, structure that is the remnant of an organ or part that was fully developed or functioning in a preceding generation or an earlier stage of development.
Vestigial Structures in Underwater Mammals!
Why these fish have this unnecessary structure in their body, scientists do not know. This mysterious femur and pelvis on a swimming mammal is unnecessary to it, so why do they have it? Scientists have many theory's though, one is that the ancestor of whales had legs. They theorize this because inside a whales or dolphins body you will see a bone far off the main spin structure.
_Georgiacetus vogtlensis
![Picture](/uploads/5/8/8/6/5886590/6564398.jpg)
In the picture to the left, you see a skeleton of an ancient whale. As you see the mammal has two legs. However, the hip bone is not connected to the rest of the skeleton, this tells scientists that even though the whale had legs, it could not walk on dry land.
Cardiographs
Why Catacea?
_Mammals that have the following characteristics:
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_Levin, Harold L.. "Chapter 16, part 6, Chapter Tutorial, Life of the
Cenozoic,Levin 2005: The Earth Through Time, 8th edition, Wiley." Wiley: Home .
N.p., n.d. Web. 30 May 2012.
<http://higheredbcs.wiley.com/legacy/college/levin/0471697435/chap_tut/chaps/chapter16-06.html>.