I'm just going to go ahead and present a piece of evidence for evolution: the eye. It is a complex structure with many parts that must work together perfectly to function. Some say that this is clear evidence that it was designed, and could not occur randomly. But when we look in nature, we can clearly see how it would arise from natural selection.
The first evolutionary step towards an eye was simply an eyespot, or a patch of photosensitive cells, which had the ability to sense light due to these proteins. These cells can only tell if light is present and some can tell the intensity, but not all. The photosensitive cells and multicellular creatures then could better react to their environment, allowing them to survive longer.
These then evolved into an eye cup, where the patch of photosensitive cells on an organism sank down into it a little. Now the organism was able to react to what direction the light was coming from, if a little imperfectly, which was an improvement over only being able to tell if there is light or not.
This eye cup then evolved into a pinhole camera due to the eyecup becoming deeper and wider while the opening became smaller. the inside of this cavity was filled with water. This is the step at which the common concept of an eye begins, as it marks the first point at which they were seeing an actual picture.
A modern day flatworm with eyecups
Then, a small film began to develop over the hole. It separated the photosensitive cells and the surrounding water for the first time, and now instead the cavity was filled with a transparent humor. It initially only protected the eye from harm, and did not magnify or do anything else to the light.
This thin layer over the eye eventually split into two separate layers, increasing field of view. Then, the one that was no longer needed to protect the eye began to thicken and formed the first true lens.
Finally, we have reached the human eye. This eye now has a fully functional lens, with two separate cavities in the eye and the ability to focus on a specific point. And it was just step by step to reach here.
(going to add more organisms later)
The first evolutionary step towards an eye was simply an eyespot, or a patch of photosensitive cells, which had the ability to sense light due to these proteins. These cells can only tell if light is present and some can tell the intensity, but not all. The photosensitive cells and multicellular creatures then could better react to their environment, allowing them to survive longer.
These then evolved into an eye cup, where the patch of photosensitive cells on an organism sank down into it a little. Now the organism was able to react to what direction the light was coming from, if a little imperfectly, which was an improvement over only being able to tell if there is light or not.
This eye cup then evolved into a pinhole camera due to the eyecup becoming deeper and wider while the opening became smaller. the inside of this cavity was filled with water. This is the step at which the common concept of an eye begins, as it marks the first point at which they were seeing an actual picture.
A modern day flatworm with eyecups
Then, a small film began to develop over the hole. It separated the photosensitive cells and the surrounding water for the first time, and now instead the cavity was filled with a transparent humor. It initially only protected the eye from harm, and did not magnify or do anything else to the light.
This thin layer over the eye eventually split into two separate layers, increasing field of view. Then, the one that was no longer needed to protect the eye began to thicken and formed the first true lens.
Finally, we have reached the human eye. This eye now has a fully functional lens, with two separate cavities in the eye and the ability to focus on a specific point. And it was just step by step to reach here.
(going to add more organisms later)
