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Sediments

sediment

(Science: biology) A precipitate, especially one that is formed spontaneously.

Origin: L. Sedimentum


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Re: Why are leaves green?

... cyanobacteria according to molecular geneticist, and there are papers that claim the chemical markers of purple bacteria are widespread in ancient sediments. This is not generally accepted (yet), though. The problem with this argument is that today, the position is reversed: purple (sulphur) bacteria ...

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by stauffie
Fri Apr 06, 2012 2:00 pm
 
Forum: Botany Discussion
Topic: Why are leaves green?
Replies: 76
Views: 293605

Re: Theories - Origin of Life

... could not have occurred by direct oxidative weathering because that is contradicted by the persistence of detrital uraninite and pyrite in Archean sediments. Science, Kasting, Vol. 293, 3 August 2001, “The Rise of Atmospheric Oxygen”, page 819 5) How did the genetic code evolve? Koonan for example ...

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by scottie
Wed Oct 05, 2011 10:11 pm
 
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 560
Views: 906977

evolution debate

... when it happened and had a good guess it would have been in a flat river delta /swamp type environment. Check the geologic maps for the right sediments at the right age and head for the Canadian Arctic. The bones were waiting for them when they got there. Where would you look for this fossil ...

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by BDDVM
Sat Jan 15, 2011 12:55 am
 
Forum: Evolution
Topic: evolution debate
Replies: 63
Views: 41620

Re:

... above the tiny-sized ones carry nematodes, you could tell where all of the organisms had been. Not sure of the continents, though, since the ocean sediments are full of roundworms too - hard to distinguish. Maybe deep sea sediments have fewer worms and thus you can distinquish the continents? I ...

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by biohazard
Thu Dec 10, 2009 7:55 am
 
Forum: General Discussion
Topic: Name a random science fact!
Replies: 12
Views: 7089

Name a random science fact!

... above the tiny-sized ones carry nematodes, you could tell where all of the organisms had been. Not sure of the continents, though, since the ocean sediments are full of roundworms too - hard to distinguish.

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by Darby
Thu Dec 10, 2009 3:41 am
 
Forum: General Discussion
Topic: Name a random science fact!
Replies: 12
Views: 7089
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