Originally posted by godservant
Against evolution, we could not have come from a single cell. Cells don't have eyes, so what made us develop an eye? According to evolution, there
must have been a period of time where the eye was being developed because the cell saw a need to make one to detect light? Then, after the eye finally
formed, it saw that it needed depth perception, so it went through a time again to make another? No way. If so, I know we have need of a couple more
hands, why is there not a couple of stubs in our armpits that will grow into two more arms in a million years? Point is, we are made/complete, nothing
is 'in progress'.
I wouldn't be so sure about that. Ancient humans were, by and large, much larger than us because they, had to be more physically active to survive.
To say that anything in the world is "permanent" is a fallacy - everything is transitory, from the forms of animals to the existence of the universe
itself. Can you name something that is permanent in this universe, without naming "God?"
On eyeballs:
The central idea is that if all creatures were originally blind, 1% of an
eye is better than nothing and will be preferentially selected. The best
idea of this apparent evolutionary change (a flat area of skin or epithelium
with light sensors, then folding inward to form first an open cavity and
later a closed cavity, first without a lens and then with a lens) is
illustrated in many evolution textbooks and popular books; checking the
index of library books on evolution might work.
What is really neat is that we can find invertebrate animals like scallops,
worms, etc. that have eyes with each of these "intermediate" conditions
(i.e., open cavity with no lens, etc.). It is also neat that while our eye
and the octopus eye look very similar, our retina is inside out (the rods
and cones on the outside of the retina, *below* the blood vessels and the
neuronal wiring) while the octopus has a retina with the rods and cones on
the inside of the retina. (This is why we can see moving blood cells when an ophthamologist shines a bright light into your eye.) It is clear that
these
different eyes evolved separately.
A clue to the origin of eyes is also found in the protein structure of our
lens and those of other animals...
There is much more on this subject, but if you're interested, and apparently you are, then you can check out these web pages for more on the
story:
www.madsci.org...
www.talkorigins.org...
Zip
