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originally posted by: cooperton
Such adaptations can be due to epigenetics. For example, high altitude trainers adjust to the change in oxygen levels by an increase in 2,3-diphosphoglycerate in the blood. After they return to normal altitudes for long enough, the 2,3-DPG levels resume normal. This is not evolution, just adapting to the environment.
Research epigenetics. A very fascinating field.
researchers raised bichirs, which are fish with functional lungs and strong fins. In a pinch, these qualities allow them to walk on land. ...
For eight months, a group of the primitive fish were raised entirely on land so that researchers could compare their development to specimens that grew up in normal, mostly aquatic conditions.
Standen and her colleagues thought that the bichir would develop differently if it grew up on land, giving them hints as to how a fish could go from water to earth as it evolved.
Sure enough, the fish raised on land walked with a more effective gait. They placed their fins closer to their bodies and raised their heads up higher, which made them slip less than the aquatic walkers.
Their skeletons also developed differently, with the bones that support the fins changing shape to support them in higher gravity.
The researchers also saw the fish acquiring more head and neck mobility, which would be important in a transition to life on land.
"Fish generally don't have necks, as they can approach their food from any angle in a 3-D environment," Standen said. "Once on a 2-D terrestrial plane, head mobility becomes essential for feeding and other sensory perceptions."
While the changes are subtle, Standen said, they mirror what scientists have seen in the fossil record of fish-to-land-dweller evolution. So it was probably a similar kind of developmental flexibility that allowed the first fish to emerge from the water.
originally posted by: Xtrozero
I'm not sure what you think evolution is or how you seem to want to apply it to say it is not a theory or that there is zero evidence.
As has the attempts at figuring out how life is possible in the first place.
originally posted by: rnaa
a reply to: cooperton
Wouldn't a second life be just as likely as life in the first place?
There is absolutely no way to know if a second life is 'possible' and it is therefor pointless to 'worry' about it.
Make the most of the life you have.
Happy now? The thread has bee completely and irredeemably hijacked.
originally posted by: ParasuvO
As has the attempts at figuring out how life is possible in the first place.
It is certainly pointless to 'worry' about it.
originally posted by: ParasuvO
a reply to: cooperton
You may have heard that, but no one has ever even claimed to find the beginnings that I am aware of.
I think you are on the right track though, what if we DID find it, what if we actually go and DO IT.
I think this is what I am going to do, I have known this since I am a small child.
Not much time left dallying either, almost ready.
originally posted by: cooperton
originally posted by: lifecitizen
a reply to:
Uh huh. Craziness is contagious it seems.
That isnt just silly, just totally ridiculous.
What? The Monkey phallus? Specify what is rediculous.
originally posted by: cooperton
Could an accumulation of adaptations/mutations be solely responsible for the diverse plethora of lifeforms we see today? Sure it could. It is also possible that this is not the case. I, personally, find it hard to believe that conscious entities (us, among other animals) were generated by incident. So my scientific search for the answers of our beginnings continues.
originally posted by: lifecitizen
No. The bit about the Earth knowing to get rid of unhealthy people and keep the healthy ones.
Yeah, all those hundreds of thousands of people that died in the 2004 tsunami weren't unlucky, they were all unhealthy. Got it.
originally posted by: Xtrozero
There will be the fastest, biggest, smartest etc..., so us being the smartest doesn't tell me much towards intelligent design anymore than the Cheetah does for belong the fastest.
Hey wait... you said answers of our beginnings evolution doesn't try and explain the beginning of life, or the why, just the how it can change over time.
Yes it is hard when it takes very long time to see changes, but we do see that the more like DNA two living creatures have the closer they are. What seems to be the case is a physical separation of a species and then each head off in their own directions to the point that they can no longer reproduce together. i.e. different species.
We see this with horses and donkeys, right on the edge of no longer reproducing, and even though they can have offspring the offspring is sterile.
Humans are close to Chimps but around 6 million years ago our ancestors had chromosome 2 A/B fuse into one. What this did was change us from 48 pairs of chromosomes into 46 pairs and most likely changed us to as we are today.
originally posted by: Exogyra
Typical. This piece is called a straw man. Set up a weak version of one side of a debate then easily knock it over. Problem is this is not what supporters of evolution say. I do not know one credible scientist that says evolution is a proven fact. You see evolution is a scientific theory. Therefore, by definition it is based on true facts, called premises, no one can deny them, it is the inference or the conclusion that is debatable. So what scientists say is that the theory of evolution is the only one that answers all the observed facts and all of the predictions are either not disproven or have been proven. There is no other competing theory that does this. This is not how the scientific method works. Way before we had fossil evidence of feathers on dinosaurs it was predicted birds and dinosaurs had a common ancestor. Way before we had fossil evidence of whale evolution it was postulated that they evolved from a wolf like creature and bingo we have fossil evidence, fact of that. These are two examples you can research.
originally posted by: cooperton
Never said that.
The assumption is that adaptations can accumulate to the point where you eventually result in an "evolved" species. Adaptations are observable and happen all the time; anti-biotic resistant bacteria, Galapagos finches, etc. But, we are only left to assume that these adaptations could accumulate to give rise to new species. It seems logically possible, but there is no direct observable evidence that this occurs. We are only left with observing adaptations.
Could an accumulation of adaptations/mutations be solely responsible for the diverse plethora of lifeforms we see today? Sure it could. It is also possible that this is not the case. I, personally, find it hard to believe that conscious entities (us, among other animals) were generated by incident. So my scientific search for the answers of our beginnings continues.