Post by Sylvia ElsePost by Wm. M. BettsPost by Sylvia ElsePost by Wm. M. BettsRichard Dawkins wrote, “biology is the study of complicated things that
have the appearance of having been designed with a purpose.”
(The Blind Watchmaker, '96. pg 1)
Francis Crick, the co-discoverer of the double helix structure of DNA,
wrote, “Biologists must constantly keep in mind that what they see was
not designed, but rather evolved.”
(What Mad Pursuit, 1990, p.138.
If it seems designed, How can we KNOW it's not designed?
The appearance of design is only superficial. Once one starts to look in
detail, the deficiencies become obvious, and it looks much less likely
that we're seeing the results of design, and much more likely that the
results are what one gets by incremental changes.
Could you provide examples?
The eye is a good example. The retina is back-to-front, so that the
light has to go through it to reach the light sensitive cells which are
on the back, thus reducing sensitivity.
The environment may play a role in the degree of sensitivity we
enjoy. Bright sun is a common environmental problem for us.
We squint, we shield our eyes with our hands, we buy sunglasses etc.
The sensitivity we have, may be opportune for the environment we find
ourselves.
The blood vessels and nerve
Post by Sylvia Elsefibres run across the front of the retina causing further loss of
sensitivity and acuity, and pass through it at one point, causing a
blind spot.
Actually, there is a trade off. The eye of the octopi, squid and related
forms have eyes similar to human eyes, but without the "faults" you
mentioned. However, the eye of the octopi has vessels, optical fibers
ETC to the sides or the eye vs nerves etc centered in human eye. The
octopi eye has restricted movement within it's socket. To look to the
side the octopi has to turn it's entire head. So, the trade off is an
advantage to humans. Furthermore, the blind spots in human eye is
aligned so that one at the time is "blind". (I believe this is true,
needs conformation) Also the brain accounts for the shortcomings.
Post by Sylvia ElseThe retina isn't attached to the rear of the eyeball, so that it can
quite easily pull away. It is, however, attached to a membrane that
surrounds the vitreous humour, and when the latter breaks down, as it
does later in life, the membrane pulls at the retina and can tear it
(happened to me).
None of the above make any design sense, and no sensible designer would
do it that way.
This may be a life-style problem. My maternal g.parents lived into
their late 90's with excellent sight. So, care and prevention,
proper diet etc may prevent many problems we have.
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