Diplocaulus

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David George
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Diplocaulus

Post by David George » Thu Mar 02, 2006 8:20 am

The Diplocaulus was an amphibian whose head was in the shape of a boomerang some what like a hammerhead shark.Does this mean it was an ancestor of the hammerhead shark no [Appearences are often deceptive].The diplocaulus probably became extinct.The reason why diplocaulus could not be the ancestor of hammerhead shark is because diplocaulus was an amphibian and sharks are fishes.No organism can evolve backwards .

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damien james
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Post by damien james » Thu Mar 02, 2006 8:31 am

Why did you post that? It's just convergent evolution. Happened a lot I think.

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David George
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Post by David George » Fri Mar 03, 2006 6:51 am

The reason why I sent this message is because there are some people who say evolution occurs in backward direction also.
"Nothing in biology makes sense except in the light of evolution"
-Theodosius Dobzhansky

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damien james
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Post by damien james » Fri Mar 03, 2006 7:13 am

But what do you mean by backward? Evolution doesn't know any better from backward or forward the way we would define it. It only selects for what is most fit for an environment. If what is selected seems backward to us, that doesn't matter. Backward is subjective.
The hand of God may well be all around us, but it is not, nor can it be, the task of science to dust for fingerprints.

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AstusAleator
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Post by AstusAleator » Fri Mar 03, 2006 11:08 am

Evolution can work "backward" in a phenotypic sense. Like Damien said, convergent evolution is very common. The fossil record shows that some reptiles after differentiating from amphibians became aquatic again (ichthyosaur) and re-aquired the fish-shaped body. The same can be observed in mammals (whales). This is not backward evolution, but simply selective pressures determining a phenotype.
David, you're right that evolution can't work backward, and Damien you're right that there is no such thing as "backward" or even forward (towards a goal) with evolution. Evolution is a funtion of many factors, including time, adaptation, and selective pressures.
What did the parasitic Candiru fish say when it finally found a host? - - "Urethra!!"

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