I dont ask a preacher because they will just tell me what they believe.. i want to know the truth.. just like i dont take scientist word (not that they are always wrong) but i like to hear all sides and form an opiniion based off all the information.
I can appreciate this. But that begs the question why go to church at all?
the thought of us forming out of a big bang and evolving sight is a roadblock to me.. how did our dna even know that with eyes we could see.. how did our dna know that with 2 eyes we could judge distance? how did we know there was color available? dont say mutation unless you can tell me what the chance of that is 1 in what? its impossable for that to of just envolved
and that is just an eye there are so much more amazing things about us ..
Yeah this is hard to get. But remember when we were talking about forensic study, you start at the present and continue to work backwards in time with the evidence that you have.
So we start with what we have, two color eyes. The reason why they are in the front of the face and not the sides is so that we can judge distance. You need two eyes to really get good perspective (Because one won't give you the depth). Put something small in front of you in the middle and close one eye and then the other. Having two eyes gives you a much better view of small objects and where to handle them. We covered the color part, because it is easier to see predators and prey in the jungle so we would survive better.
Interesting fact if you were not already aware. Land animals have developed the location of their eyes based on where they are in the food chain. If you see eyes on the side of the head it almost always (I say almost again because there may be somethign somewhere, but I doubt it) are the prey animals. They use the side eyes to track animals trying to flank them and since they don't need to worry about depth perception to eat grass or leaves it works well. Predators (meat eaters) almost always have eyes in the front of the head so that they can have that depth view when in battle.
Ok anyways sorry.
So we move back through evolution and get more and more primitive eyes colorblind, ect.
Eventually we need to figure out why we have eyes, so more it turns into a study of where they eye developed.
Here is a good cut/paste from:
http://www.pbs.org/wgbh/evolution/library/01/1/l_011_01.html
The simple light-sensitive spot on the skin of some ancestral creature gave it some tiny survival advantage, perhaps allowing it to evade a predator. Random changes then created a depression in the light-sensitive patch, a deepening pit that made "vision" a little sharper. At the same time, the pit's opening gradually narrowed, so light entered through a small aperture, like a pinhole camera.
Every change had to confer a survival advantage, no matter how slight. Eventually, the light-sensitive spot evolved into a retina, the layer of cells and pigment at the back of the human eye. Over time a lens formed at the front of the eye. It could have arisen as a double-layered transparent tissue containing increasing amounts of liquid that gave it the convex curvature of the human eye.
In fact, eyes corresponding to every stage in this sequence have been found in existing living species. The existence of this range of less complex light-sensitive structures supports scientists' hypotheses about how complex eyes like ours could evolve. The first animals with anything resembling an eye lived about 550 million years ago. And, according to one scientist's calculations, only 364,000 years would have been needed for a camera-like eye to evolve from a light-sensitive patch.
Wow just found this try it (directions below picture):
Close your left eye and stare at the cross mark in the diagram with your right eye. Off to the right you should be able to see the spot. Don't LOOK at it; just notice that it is there off to the right (if its not, move farther away from the computer screen; you should be able to see the dot if you're a couple of feet away). Now slowly move toward the computer screen. Keep looking at the cross mark while you move. At a particular distance (probably a foot or so), the spot will disappear (it will reappear again if you move even closer). The spot disappears because it falls on the optic nerve head, the hole in the photoreceptor sheet.
Also I found that if you look at it about a foot from the screen and simply turn your head in a 'no' way with one eye closed you lose sight of it too (kind of disapears).
Anyway.
Did you know?
Like some other lizards, the Asian water dragon has a light sensitive spot located on top of its head known as the "parietal eye".
The light sensitive spots can be found in nature. Now most will have a more delevoped form as well. But you figure that you can feel the suns rays on your skin right, that would be a good place for the mutation to begin very early on. The mutation would allow just a sensitivity to light that would move to the next step, pigment cup.
Flat worms have this pigment cup.
Then Pin hole sight:
Pinhole eyes, in which the size of the pigment aperture is reduced, have better resolution than pigment cup eyes. The most impressive pinhole eyes are found in the
mollusk genus
Nautilus, a member of a
cephalopod group that has changed little since the
Cambrian period.
Ok the rest is pretty followable from there. So we got the eye development down.
Life:
If you can follow down to the eye, the next step is to get to the first lifeforms. We discusses this before. Basically it comes down to a bunch of factors that this planet had going for it. We are a good distance from the sun without being too far. So we are not too hot or too cold. Then you have a collision with another planet that spins off the moon (or moon is huge compared to its planet) this slows the spin rate to create the 24 hour day, and no crazy storms.
Then also this keeps our planet's crust/core from fully forming (like mars) into one mass so we get plate techtonics, This means that we get volcanoes that heat up water, and nasty checmicals in the air. This mixing with water, chemicals, temperature, lightning, oxygen, ect all created a brew for the earliest particles that made the first life on our planet to form.
This has been done in lab experiments
http://www.wired.com/wiredscience/2009/05/ribonucleotides/
So now we have life that through billions of years evolved to today.
So how did the earth form:
Basically our solar system was all a bunch of hurdling rocks gravitating around our star (that is hurdling through space). And those rocks bumped more and more int eachother until planets where formed.
http://ircamera.as.arizona.edu/astr_250/Lectures/Lec_22sml.htm
Here is a more readable one that I linked the other day:
http://geology.about.com/od/nutshells/a/aa_earthbirth.htm
So then through the math that I had talked about earlier, we can follow the paths of these different solar systems and things in space to one central point. For that central point to be there that would mean that they had to of all at one point been apart of eachother. Right now the most scientific reason is the big bang theory. I think eventually it may somewhat be replaced, but the thing replacing it will still hold that is a point where one large explosion happened, but it could be something like that was one of many 'massive black holes' and there were several 'big bangs' which when you follow those back you find yet again one spot, on and on.
Anyway when you start from the info that we have, and real world examples, and math the timeline goes like this: Giant explosion that sent material out>> Material circles around the sun (large gravitational force that causes all debri to surround and rotate around it) >> material bumps into eachother and forms planets >>> planets collide and create moon and slow earths rotation allowing for plate techtonics and easier weather >>> weather mixed with several other factors shocked by lightning creates earliest particles of life >>> Life particles mix together and create earliest forms of life >>> Those mutate and combine to make newer more complex lifeforms >>> Lifeforms develop special advantages like light sensitive skin cells (seen today on some animals) >>> Those pigment cells develop further in lifeforms like flat worms that allows then to mutate into a more cave type depression to focus the light changes >>> Then more mutations form the pin hole eye >>> Eventually a skin is put over it (mussels) >>>> Turns into a lens (Octopus) >>> Evolution pushes water animals to develop into land life, where the eye is even more advantagous that in water so it further develops and speciallizes depending on the hunting paterns of the animal >>> Eventually humans evolve with color sight that allow them to see animals in the jungle.
And there you go, big bang to color sight.