Prehistoric world and Evolution

[cromagnon]

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first of all this will not be a question of , if evolution did happen. but how evolution happend.

lets take a journey in the past where we will be able to meet creatures of the past.

from the beauty of evolution , share what u think about the past.


[IMG]http://api.ning.com/files/ElSTxSdJ6GKfF9w-7NGlokSdP9eAr7dVhCt2RLSFSUymNAPZvt*pCDwyeFMuV1xgkN RgD426tILuGaGczBtrNxnpP2LEFyXo/earth_carboniferous_riverbank_600.jpg[/IMG]

[cromagnon]

giant insects of the carboniferous

28 July 2008


The Carboniferous period gets its name from the vast deposits of coal it left behind. This coal had to come from somewhere, and it did: from the enormous swamps that covered the supercontinent Pangaea, which formed over the course of the Carboniferous. These swamps were full of the most primitive land plants, like horsetails, ferns, and lycopods, but grown to a massive size in the oxygen-rich environment they created.

Estimates have placed the atmospheric oxygen content during the Carboniferous at as high as 35% (oxygen currently makes up 21% of the atmosphere). Scientists believe that this high oxygen content not only allowed plants to attain incredible stature; it also facilitated the existence of other gigantic organisms, including the dragonfly Meganeura, whose wingspan was seventy centimeters (two and a half feet).

Many different species of gigantic dragonfly existed during this period, as well as gargantuan versions of our modern mayfly and, of course, cockroach. Scientists believe that high oxygen levels compensated for the inefficiency of the insects’ respiratory systems, which, unlike humans’, are not centralized and rely on the passive diffusion of air through their tissues. In the lower-oxygen-content atmosphere of today, insects’ respiration is too inefficient to allow their bodies to grow much thicker than (in the dragonfly’s case) a pencil, and indeed, giant insects began to disappear as the Permian period dawned and oxygen levels began to decline.

[brownprose]

i realize nga maypa dire nalang nato ipost atong comments about evolution. it makes sense gyud specially those who truly understand it.

[cromagnon]

they may call it god . which is strictly not allowed here.

but i call it the the beauty of life force .

[bardster]

^^ May the force be with you!

[grovestreet]

how did dinosaurs get so big?

[cromagnon]

^ the abundance of plant life during that time , and the absence of predators within their size.

^^ May the force be with you!

lol, u too

[lomotel]

question lang bai..If not God then who do you think designed the basic blue prints of live which is the DNA?

As what they say, nothing comes out of nothingness.

[Bahalina-boy]

how did dinosaurs get so big?

cge cguro ni sila kaon

[cromagnon]

question lang bai..If not God then who do you think designed the basic blue prints of live which is the DNA?

As what they say, nothing comes out of nothingness.

it was a chemical reaction , but we respec ur belief although this is not the right foru, to debate. hehe