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|#125 - Do people really believe this crap!? Adaptation makes sense. A… [+] (11 new replies)||07/11/2014 on Evolution||-6|
#131 - kanadetenshi (07/11/2014) [-]
Also it seems rather funny that for something that apparently violates the "law of science" it's overwhelmingly accepting by every respectable scientist in the fields of biology, paleontology and genetics. In fact over 97.3% of Biological Sciences department heads accept there is no scientific controversy over evolution
#127 - kanadetenshi (07/11/2014) [-]
Adaptation is the mechanism of evolution.
Also a reptile doesn't just "change" into a mammal. Terms such as reptiles and mammals are arbitrary terms, they are given to animals when certain morphological criteria are met. For example reptiles have to be a cold blooded animal, that lays eggs, and that has a body covered with scales or hard parts. Where as mammals have fur, middle ear bones and mammary glands. There tend to be some exceptions but those are the basics.
Now it is not so farfetched to say that when two groups of reptiles are isolated from eachother they are going to adapt to different enviroments and develop different features, over a long period of time all these adapted features are becoming so different from what they originally where that they can no longer be identified as reptiles, et viola you have mammals. This ofcourse takes millions of years and millions of generations as they gradually evolve.
The evolution from reptile features towards mammal features can easily been seen in the fossil record (Synapsids, Cynodonts, Dinocephalians) Which feature both features from reptiles and mammals. And even in modern mammals you'll still find reptillian traits such as egg laying mammals, autotomy in mice and even yolk sacs in humans.
#169 - aldothenazi (07/11/2014) [-]
I've been interested in evolution for few months now and I'd be interesting to hear from someone who actually studies it.
#175 - kanadetenshi (07/11/2014) [-]
Punctuated equilibrium was a hypothesis that was made from a paleontological perspective to explain the lack of gradualism in the fossil record as the fossil record rather shows a rapid and static view instead of a gradual one.
My main problem with PE is that it was made purely to answer the lack of gradualism in the fossil record. But the more simple explanation to that is simply that fossils just aren't very preserved well and deteriorate after a while, so the ones we do find are ones that are in solid conditions. Aside from the hypothesis is also criticized by paleontologists that say parts of the fossil record do support gradualism.
To say that evolution is either gradual or rapid is looking at it wrongly, the rate of evolution is never constant and relies on how the enviroment is. So PE does occur, but it's not the main pattern in evolution.
#210 - aldothenazi (07/12/2014) [-]
Also I stumbled on something called commensalism and I thought at the beginning that how examples such as psuedoscorphion being attached on crane fly's leg wouldnt affect the fly at all ? Obviously it would take more energy to move around and thus need more to eat to hunt etc etc. My main concern is that is commensalism just a term coined cause there had to be something to explain that phenomena and it wouldnt fit in parasitism or mutualism ? Or could the psuedoscorphion give some underlaying benefit to crane fly without we being able to observe?
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