Design flaws in organisms indicate evolution, not intelligent design

[Compassionist]

The existence of design flaws in living organisms is often cited as evidence for evolution by natural selection rather than intelligent design by an all-loving, all-knowing, and all-powerful deity. If such a being existed and created life intentionally, we might expect optimal design yet what we see instead are structures and processes that are inefficient, prone to failure, or even harmful.
Here are some significant biological design flaws that point to evolution rather than perfect design:
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1. Human Birth Canal vs. Big Brain
Flaw: Human babies have large heads due to our large brains, but the human pelvis is narrow for bipedal walking.
Result: Childbirth is extremely painful and dangerous a leading cause of death historically.
Evolutionary Explanation: Our ancestors evolved larger brains and upright walking separately, leading to a dangerous compromise.
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2. Wisdom Teeth
Flaw: Most people don't have room for third molars, causing impaction, infections, and pain.
Result: Many need surgery to remove them.
Evolutionary Explanation: Our ancestors had larger jaws due to diet, but modern humans' jaws shrank faster than tooth evolution could keep up.
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3. Human Retina Is Backward
Flaw: The photoreceptor cells in the human eye are behind layers of neurons and blood vessels.
Result: Creates a blind spot and reduces image quality.
Evolutionary Explanation: The eye evolved incrementally, not from a clean-slate design.
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4. Recurrent Laryngeal Nerve (Giraffe Example)
Flaw: This nerve travels from the brain to the larynx, but loops around the aorta.
Result: In giraffes, it travels over 15 feet instead of a direct path of a few inches.
Evolutionary Explanation: It's a leftover from fish ancestors, where this path made sense. Evolution modified existing structures rather than redesigning from scratch.
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5. Human Menstrual Cycle
Flaw: Humans shed the uterine lining even if not pregnant, wasting resources and causing pain.
Result: Menstrual cramps, anemia, mood changes.
Evolutionary Explanation: Other mammals reabsorb the lining. Our approach may have evolved due to pathogen risks in internal fertilization.
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6. Shared Path for Food and Air
Flaw: The esophagus (food) and trachea (air) share an entrance.
Result: Risk of choking a leading accidental cause of death.
Evolutionary Explanation: The throat evolved in stages, without foresight.
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7. Human Spine and Back Pain
Flaw: Our spine is an S-curve not ideally suited for upright walking.
Result: Many people suffer chronic back pain, herniated discs, etc.
Evolutionary Explanation: Our ancestors were quadrupeds. The upright posture evolved later, leading to inefficient structure.
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8. Brain Vulnerability and Mental Illness
Flaw: The brain is highly energy-consuming and prone to many dysfunctions.
Result: High rates of depression, anxiety, bipolar disorder, schizophrenia, etc.
Evolutionary Explanation: Natural selection favored reproductive success, not mental wellness or long-term wellbeing.
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9. Knee Joint Design
Flaw: Knees bear immense strain, especially the ACL (anterior cruciate ligament), which often tears.
Result: Common injuries in sports and aging.
Evolutionary Explanation: Knees evolved from quadruped ancestors, not optimally engineered for bipedal running and jumping.
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10. Genetic "Junk" and Mutations
Flaw: The genome is full of non-coding or redundant DNA and is prone to harmful mutations.
Result: Genetic diseases, cancer, and congenital defects.
Evolutionary Explanation: DNA accumulates "baggage" over time. There's no intelligent editing or streamlining process.
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11. Susceptibility to Cancer
Flaw: Cells divide for life but are prone to mutations that cause cancer.
Result: One of the top global causes of death.
Evolutionary Explanation: Cell division is essential for life, but natural selection can't eliminate all cancer risk especially after reproductive age.
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12. Human Psychology Biases
Flaw: We are prone to cognitive biases (e.g., confirmation bias, tribalism, overconfidence).
Result: Misjudgments, discrimination, and conflict.
Evolutionary Explanation: These evolved to enhance survival in specific environments, not to produce truth-seeking rationality.
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If we were designed by an omnibenevolent, omniscient, and omnipotent being, such flaws are impossible to justify. Evolution by natural selection, on the other hand, explains these quirks and imperfections as the result of a messy, blind, trial-and-error process where old parts are tweaked, not replaced, and survival/reproduction, not perfection, is the end goal.

[Carnivalfaces]

[Replying to RBD in post #289]

First off there are no "anti creationist macro evolutionists" that I know of. Please define and produce a source if you can for such a thing.

Evolutionary biologists understand the discoveries made, the predictions, the experimentations, the fossil and geological confirmations combined with various studies of adaptations and microscopic observations of species with much smaller life cycles. The documented generational impact and follow up research shows up everywhere, that what makes micro evolution and alterations within species possible also makes macroevolution possible where the differences accumulate to the point they no longer recognize each other as the same species and can not reproduce with each other. Further down the line they no longer resemble each other.

That is both demonstrated within time lines of geographical layers of the earth, the fossils we find contained therein, and what we see of studies like the London tunnel mosquito. Where average mosquitos were trapped in the London underground. Well as entomologists studied this further they realized the tunnel insects became more translucent and at junctures where the outside mosquitos interreacted with the tunnel insects they didn't recognize one another and couldn't reproduce. That is one point of speciation, they are now different species. Origin of species.

Now at this point they are still both mosquitos, that is true. But as the individual environments continue to change, so do they and eventually they look nothing alike millions of years later, while yet some others do and go off in other directions as well. You do understand evolution doesn't purpose all species take every path of evolution in lockstep, don't you? Probably not.

[The Barbarian]

Four legged tetrapods were never fish, nor an evolutionary link between fish and amphibians.

Sorry, that excuse won't work. Icthyostega, for example, is a land animal. No gills. Just lungs. Solid legs, unlike Acanthostega.

Acanthostega is a fish. Internal gills, lateral line system, limbs adapted to moving in shallow water, but not walking on land. Like most early fish, it had lungs, but the ribs could not have supported breathing on land. But it has four legs, the bones of which are derived from the find bones of other lobed-fin fish. And the limbs are not securely attached to the spine, meaning that this fish had not evolved the ability to walk on land.

Correct. It's a fish, not a mammal. Exactly what a fish hybrid looks like.

Perhaps you don't know what "hybrid" means. What do you think it means?

Find the necessary changes between this fish and any mammal.

I think you mean "tetrapod." But notice the differences between the fish Acanthostega and the tetrapod Icthyostega. Internal gills, legs derived from fins, but not connected to the spinal column. Internal nares.

But first show any incremental transition fossils between this hybrid and other fish.

Already did. I showed you a complete and gradual transition from fins to limbs.

Otherwise, we simply have a discovered fish hybrid,

Again, it appears that you don't know what "hybrid" means.

as easily explained by creation,

For a Christian, evolution is God's creation.

Acanthostega is pretty much exactly what a transitional tetrapod should be.

Acanthostega, Ichthyostega, etc... are all water fish

No. Icthyostega doesn't even have gills. You were badly misled about that.

Show a gilled fish with walking legs for land

Even today we have those. Some can even climb trees:

or land mammal with fish fins for swimming.

If that was true, evolutionary theory would be in big trouble. Limbs do sometimes revert to fins, but not back to fish fins:


Sure, like all tetrapod bones, they have the same specific bones as those of lobed-fin fish, but they are clearly evolved from legs. Which as you now see, evolved from fish fins.

[The Barbarian]

Now if you can get proof between reptiles and mammals,

Sure. The division between reptiles and mammals is that reptiles have several bones in the lower jaw, and mammals have one. So what would the transitional there be?

Here it is:


Diarthrognathus, an animal with both the reptilian, and the mammalian jaw joint. The transition is noted in a series of fossils:



Gradually, the other bones were moved to the middle ear, to form the three-boned form we see in mammals. Even more convincing we see this process in the embryos of some mammals like the opossum:
https://www.igb.illinois.edu/article/de ... ry-history

In the opossum embryo, there are two bones in the lower jaw. Later in development, one migrates to the middle ear to form the mammalian system.

and not only mammal-like reptiles, or man-like hominoids.

H. erectus, for example, is almost identical to anrchaic H. sapiens. Can you show me even one essential difference?

As well as some previous nonbird,

Sinosauropteryx. Can you name me even one characteristic of birds that is not found in at least some other dinosaurs? I'd be interested to see what you have. I can't think of one.

nonwhale

There's a complete series of these now.


As you now see, all this evidence for those transitions are, in the words of YE creationist Dr. Kurt Wise, "very good evidence for macroevolutionary theory."

So, while macroevolution of physical creatures remains unproven,

Even honest YE creationists now admit that evolution of new species is a fact. Perhaps you don't know what "macroevolution" means. What do yoiu think it means?


The rapid origin of new species (in thousands of years or less) is not speculation but demonstrated fact,
YE creationist John Woodmorappe Noah's Ark; a Feasibility Study

The rapid origin of new species is called creation, not evolution.

The proper term is "macroevolution." Microevolution is evolution within a species. Macroevolution is the evolution of new species.

Macroevolution involves variation of allele frequencies at or above the level of a species, where an allele is a specific iteration of a given gene. It is an area of study concerned with variation in frequencies of alleles that are shared between species and with speciation events, and also includes extinction. It is contrasted with microevolution, which is mainly concerned with the small-scale patterns of evolution within a species or population.

https://www.biologyonline.com/dictionary/macroevolution