Comments on: Carl Sagan's evolution animation from Cosmos

By: Jason E

Jason E — Wed, 22 Aug 2007 13:10:42 +0000

It could be suggested that perhaps sexual reproduction helps to form relationship bonds between the two parties, thusly leading to parental nurturing.

Surely the offspring of certain species in certain habitats were able to more easily survive under the care of its two parents versus what would have been the normal asexual reproduction method...

Just a quick thought.

By: Adam Stanhope

Adam Stanhope — Tue, 21 Aug 2007 20:10:12 +0000

Great question, Ben!

I always make the mistake of working from the assumption that evolution worked FOR or TOWARDS a given step when what in fact we should view evolutionary changes as random events that succeeded.

What is the evolutionary step up that sexual reproduction created? Is it the fact that it was a new, powerful means to cause big changes to a given species' DNA above and beyond what happens in mutation or errors in copying DNA during asexual reproduction?

Anyone?

By: Ben

Ben — Tue, 21 Aug 2007 01:29:41 +0000

The only part of the whole chain that boggles my mind is the development of sexual reproduction. how? why? All other elements make perfect sense - have no doubt, I am 100% on the side of evolution, that one little bit just blows my mind.

By: Jason E

Jason E — Mon, 20 Aug 2007 17:27:03 +0000

You don't have to take the "leap of faith" into evolution to find proof that fish developed lungs, Peach. All you have to do is examine the lung fish.

http://mama.essortment.com/lungfish_rank.htm

By: Clutch

Clutch — Mon, 20 Aug 2007 17:26:25 +0000

In another billion years, we won't look like we do today as humans anymore, but something else. Maybe just blobs.

By: Adam Stanhope

Adam Stanhope — Mon, 20 Aug 2007 17:07:08 +0000

Those must have been some special fish, because every fish I have seen dies in a few minutes without water.

Ah - yes - but not the ones with primitive lungs, Peach.

By: Peach

Peach — Mon, 20 Aug 2007 16:58:29 +0000

Quote, "During the summeer, some lakes and swamps dried up, so some fish developed a primitive lung to breathe air until the rains came." Those must have been some special fish, because every fish I have seen dies in a few minutes without water. I know...they died and then came back to life once the rains came. Over millions of years, they bacame very tired of dying and coming back to life, so it just made sense to develope a lung... and maybe reverse scuba gear for that pesky transistional period.

By: Siduri

Siduri — Sun, 19 Aug 2007 22:46:04 +0000

Then there's Sagan's cosmos for rednecks: http://www.youtube.com/watch?v=VYOYfG0QGG0

By: Adam Stanhope

Adam Stanhope — Sun, 19 Aug 2007 21:33:37 +0000

Flame on you, Michael.

By: Alex

Alex — Sun, 19 Aug 2007 20:42:14 +0000

Fake... oh, wait... wrong post!

By: Michael

Michael — Sun, 19 Aug 2007 18:54:59 +0000

Sagan was a fricken genius.

you know, in my opinion, evolution is far more grand, beautiful, and elegant than "intelligent design".
I hope that this thread doesn't turn into a huge fundamentalist-flame-fest.