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EvC Forum ⇒ Science Forums ⇒ Biological Evolution ⇒ Explanations for the Cambrian Explosion
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Author Topic:   Explanations for the Cambrian Explosion
bluescat48
Member (Idle past 2269 days)
Posts: 2347
From: United States
Joined: 10-06-2007

bluescat48 Posts Only
Message 136 of 137 (488750)
11-16-2008 5:33 PM 		Reply to: Message 117 by AlphaOmegakid
11-10-2008 11:24 AM

Re: Most Invertebrates have HARD parts.
And they look just like modern insects.

What else would they look like? Considering that over a million insect species have been classified, many of theses species look remarkably alike but they are genetically different.

There is no better love between 2 people than mutual respect for each other WT Young, 2002

Who gave anyone the authority to call me an authority on anything. WT Young, 1969

This message is a reply to:
 Message 117 by AlphaOmegakid, posted 11-10-2008 11:24 AM AlphaOmegakid has not yet responded
    
NosyNed
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Posts: 8838
From: Canada
Joined: 04-04-2003

NosyNed Posts Only
Message 137 of 137 (491693)
12-19-2008 2:57 PM

Oxygen Levels and Multicellular life
http://www.cosmosmagazine.com/news/915/darwins-dilemma-solved-researchers

This article discusses the measurement of oxygen levels and the appearance of more complex life forms.

quote:
The sudden appearance of large animals more than 500 million years ago may be due to a huge increase of oxygen in the world's oceans, according to Canadian researchers.

quote:
The research analysed sediments found in 2002 by Narbonne and his research team that contained fossilised 575 million-year-old complex life forms sandwiched between layers of sandstone. Their find pushed back the age of Earth's earliest known complex life to soon after the melting of the "snowball" glaciers of the massive Gaskiers Glaciation 580 million years ago.
  
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