Why Didn't Nature Develop the Wheel?

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Discussion Overview

The discussion revolves around the question of why nature has not developed the wheel as a biological mechanism, exploring evolutionary, mechanical, and biological perspectives. Participants examine the implications of wheel-like structures in nature, the challenges of creating such mechanisms in living organisms, and the existence of rotary motion in certain biological entities.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • Some participants suggest that the complexity of connecting biological systems to a rotating structure, such as a wheel, poses significant challenges, including the risk of twisting and breaking essential components.
  • Others point out that while the wheel as a distinct mechanism may not exist, nature has developed rotary motion in organisms, such as the flagella of E. coli, which functions similarly to a wheel.
  • A participant humorously proposes a divine explanation for the absence of wheels in nature, while another questions whether the wheel was a human invention or predated human evolution.
  • Some argue that the efficiency of legs in navigating uneven terrain makes them more suitable than wheels for most animals.
  • There is a discussion about the microscopic and macroscopic examples of circular motion in nature, such as the movement of ova and the dispersal of tumbleweed.
  • One participant introduces the concept of the square-cube law, explaining how it limits the size and complexity of living organisms, which may affect the feasibility of developing a wheel-like structure.
  • Another participant discusses the potential for engineering a living organism with wheel-like features through genetic manipulation, although this remains speculative.
  • Some participants debate the mechanics of sperm movement, with differing views on whether it involves a true rotational mechanism or a different form of motion.
  • There is a playful mention of animals like armadillos and hedgehogs exhibiting wheel-like behavior when rolled, though this is clarified as more akin to ball-like motion rather than a true wheel.

Areas of Agreement / Disagreement

Participants express a range of views on the topic, with no clear consensus on why wheels have not evolved in nature. While some agree on the existence of wheel-like motions in certain organisms, others maintain that the wheel as a distinct mechanism is absent in biological evolution.

Contextual Notes

The discussion highlights various assumptions about biological design, the limitations imposed by physical laws, and the speculative nature of potential genetic engineering solutions. The complexity of defining what constitutes a "wheel" versus wheel-like motion is also noted.

DaveC426913
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Why did nature never invent the wheel?
 
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Hooking up nerves, blood vessels, etc. to a spinning disk is very difficult, as they would tend to twist and break. If the disk were dead matter, then the question of how to grow it and actuate it is difficult. Finally, the benefit is not so great, because natural ground is usually bumpy and legs are more suited to that.
 
Bacteria such as E. coli swim through liquid using a rotating 'propellor'. So nature has invented a rotary motor, if not quite a wheel.
 
DaveC426913 said:
Why did nature never invent the wheel?
because God told her not to.
 
i thought man invented wheel??

OR, do you mean to say, that wheel was already existed on Earth before apes evolved into humans.
 
He means to ask : "If the wheel is such an efficient means of transport, why is it that no form of animal life has evolved with wheel-like appendages ?"
 
Well, Nature has exploited circular objects and surfaces in many of its designs. Many mammalian joints follow the classic ball-and-socket design that allows circumduction (full 360 degree range of movement).

More explicitly, on a microscopic level, the movement of ova down the Fallopian tubes is nothing if not wheel-like. Ditto for the rolling motion of leucocytes along the vascular wall prior to integrin/selectin mediated interactions leading to diapedesis in the process of acute inflammation.

Macroscopically : tumbleweed (Russian thistle) uses the principle of a wheel (or rather a ball) in dispersion.
 
The E. coli bacterium, as I said before, has a true rotary motor. This is not some mere ball and socket joint, the flagella actually spin right round through many many revolutions - just like a wheel on its axle.

http://www.cat.cc.md.us/courses/bio141/lecguide/unit1/bacpath/flagella/flagella.html

The motor of E. coli rotates 270 revolutions per second!
 
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Bart got the right answer. The wheel requires an axle - a physically separate component. How does a living body create a component that it can't nourish?

Ceptimus figured out that it is a trick question. Bacteria have indeed invented the wheel (or at least the propellor).


The trick is that on a bacterial scale, the square-cube* law is not so restrictive. You can transfer nourishment across the boundary between the two components.

*The square-cube law: a doubling of an organism along one dimension creates an area through any component of the organism that is four times, and a mass/volume of eight times.

It limits the sizes of living creatures in many ways,
- one of which is where nutrients to feed a volume of tissue are, by geometry, forced to pass through a surface defined by an area. Common examples are: the lungs, the placenta,
- another of which is supporting bones (a femur on a 12 foot man is 4x the area, but a 12 foot man weighs 8x as much.)

The law works in reverse: smaller creatures have more surface per unit volume.
 
  • #10
Maybe just a little larger than Bacteria is one half of the first of us all.
Sperm also moves by rotating its tail.
 
  • #11
I believe that sperm do not use an axle mechanism. I believe that sperm send a circular pulse down the shaft for their tail, which does not require actual rotation.

You can simulate this by holding a towel or whip or string, and rotating your hand as if you were drawing a circle on a blackboard with a piece of chalk.
 
  • #12
You know, an armadillo on an incline can act in a wheel like manner if given a little shove in the appropriate direction. :biggrin:
 
  • #13
Matt
The armadillo (and hedgehog) is creating a ball not a wheel.

Dave
I'm sure the text I'd read discribed it as rotation, and I'm sure they would describe medical items acuratly.
However in their circles they may not see a difference between "rotation" and "circular flexing".

With control of the DNA - combining maybe Shellfish for a hard 'wheel' and Crab for exoskelaton and molting do you think you could design a "living wheel that might work for the adult. Power from some other limb so only nourishment need go through the axial and maybe not all the time.

It'd be weird for sure.
 
  • #14
Probably legs where more likely to develop, considering the chemistry and physics of spontaneous mutations to the first replicating chemicals.

However, there does exist some wheel-like motion in the animals kingdom:
http://www.blueboard.com/mantis/bio/wheel.htm
 
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  • #15
gerben said:
wheel-like motion in the animals kingdom:
http://www.blueboard.com/mantis/bio/wheel.htm

Nice link - Wheel like is the key I'm sure. Using the entire body is more like making a section of a ball though. I'm sure Dave refers to a wheel with axle to connect to the body.

To evolve something (or force it if you could control the DNA) would maybe start with something like a smooth solid oblong ball, requiring no nourishment at all, enclosed in a 'socket' much like the ball in the mouse or trac-ball used with our PC's.
 
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