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rossum



Posts: 178
Joined: Dec. 2008

(Permalink) Posted: Nov. 01 2011,06:58   

Quote (forastero @ Nov. 01 2011,02:35)
Described recently as "the most important evolutionary event during the entire history of the Metazoa," the Cambrian explosion established virtually all the major animal body forms

A few points.  Was the description correct or incorrect?  A Muslim might describe Christianity as a false religion, is that description correct?  What evidence can you provide that this description is a correct one?  For example, I disagree.  I think that, "the most important evolutionary event during the entire history of the Metazoa," was the original evolution of the first Metazoan, back well before the Cambrian.

Note that plant body forms are not mentioned.  All land plant phyla appeared after the Cambrian.  Why is that?

Note the word "virtually", not all but "virtually all".  Many animal phyla, but not all of them, and no land plant phyla at all appeared in the Cambrian.  Looking at the figures, nine animal phyla and no land plant phyla appeared in the Cambrian, of a total of 45 phyla.  Nine of 45 is 20% of metazoan phyla.  Important, but not overwhelmingly important.

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Compared with the 30 or so extant phyla,

Animal phyla.  Again, your sources are omitting plant phyla.  Ever wonder why your sources are leaving out inconvenient data?

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some people estimate that the Cambrian explosion may have generated as many as 100.

And some estimate a lot less.  Where is the evidence to support this estimate?  After all, the people giving the estimates are scientists, and you know that scientists can't be trusted when it comes to evolution and biology.

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as James Valentine of the University of California, Santa Barbara, recently put it   Lewin, R. (1988) Science, vol. 241, 15 July, p. 291

Bwahahaha!  You don't read this stuff before you post it, do you.  1988 is not "recently", it is ancient history for biology.  We hadn't even sequenced the human genome in 1988.  That may be recent for theology, but it isn't recent for biology.

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And they weren’t “all” squishy invertebrates either. Heck, even fish have been found in the Cambrian

The non-fossilised ones were usually squishy.  I wasn't talking about the one that we have fossils for in that sentence.  You might also look at the dates for the Cambrian Explosion and the dates for actual early fish fossils.  We have probable chordates, such as Pikaia, from just after the Cambrian Explosion but no vertebrates.  The vertebrates appear later.

Your creationist/ID sources are supplying you with faulty information.  You really need to double check what they tell you before posting.  Be sure that we will check things if you don't.

rossum

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The ultimate truth is that there is no ultimate truth.

  
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