What is Convergent Evolution?
According to ScienceDirect, it is “the independent evolution of similar traits in different lineages resulting from strong selective pressures” [1]
The Natural History Museum gave a stunning and clear example of Convergence: “Bats and birds are very different creatures – a bat’s wing is more like a human arm than a bird’s wing. Yet both have evolved the remarkable ability to fly. A shared ability like this with independent origins is an example of convergent evolution.” [2]
The Earth is filled with surprising examples of similar designs among unrelated creatures. Some people claim this is evidence of the power of evolution and natural selection. Still, from a different perspective, the astonishing similarity of designs among unrelated creatures is powerful evidence of a Common Designer.
Things get very interesting when we ask “Why?” Why should unrelated creatures look and sometimes act almost exactly the same? How did this come about? The puzzle is made so much more complicated by the fact that biologists are discovering this trend at nearly every level of biology. When taking a closer look, they find these “similar but different” designs in the tiny molecules that make up unrelated cells, even those separated into different kingdoms, such as animals and plants. They also find similar complex organs and organ systems within unrelated animals, which fall into different classes completely.
Charles Darwin expected natural selection to produce “endless forms,” but now the evidence points to a limited range of very similar forms appearing repeatedly in many unrelated creatures. So, what does this consistent sameness reveal about our world?
Evolutionists are calling this phenomenon convergent evolution. Proponents of ID call this phenomenon Intelligent Design.
A growing number of evolutionists, such as Conway Morris, propose that evolutionary pathways are limited, so evolution continually produces similar solutions to problems at every level. They may presume that the rules of our universe constrain what’s possible for physical development and functions; some yet-undefined rules produce similar designs over and over, and yet Evolutionists are still trying to work out what these rules of “convergent evolution” might be—the details about how natural selection could produce these patterns and why this should happen.
In short, this means they don’t have an answer, and their hypothesis is not even fully defined.
Here are two examples to show the phenomenon clearly for sight and flight:
1. Eyes
An article was published in the famous online journal Nature.com: Eye-like ocelloids are built from different endosymbiotically acquired components [3]
The University of British Columbia wrote a review of this article:
“The work sheds new light on how very different organisms—in this case, warnowiids and animals—can evolve similar traits in response to their environments, a process known as convergent evolution… When we see such similar structural complexity at fundamentally different levels of organisation in lineages that are very distantly related, then you get a much deeper understanding of convergence, said UBC zoologist Brian Leander, senior author on the paper.” [4]
What he meant by this last statement is that, regardless of how improbable (or illogical) this concept seems, we will marvel even more at the ‘miracle’ of convergence. Or in other words, the fact that this concept makes no sense is exactly why it allows you to better understand convergence evolution. How is this logical? Scientific?
We have questions:
- How do organisms without eyes know they are blind and so, need eyes to see?
- What type of environment would convince an organism’s DNA that it needs to see in order to put pressure on it to make the change (randomly mutate) or die?
- Where would the organism get the physical components inside its current form that will enable it to see?
- How will this organism create offspring that will begin to inherit these components that will lead to eyes being formed over millions of years?
- Why do different organisms have radically different eyes; some with 8 eyes, some with 2, some with 1, some are colour blind, and others have composite eyes?
- Why don’t plants have eyes?
A more specific question: why do the Nautilus cephalopods have completely different [far less complex] eyes than those of every other cephalopod? These creatures are all related biologically (in the same class, Cephalopoda), and yet ‘evolved’ completely different eyes. And, that’s not all that is different – read more about the Nautilus here in an article on the Australian Museum’s website. [5]
2. Wings
Flight occurs in many groups of creatures: (a) birds; (b) insects—flies, bees, wasps, butterflies, moths; (c) mammals—bats; (d) reptiles—the extinct pterosaurs (e.g., pterodactyls and Pteranodons). In each case, the wings are substantially different, and there is no evidence whatsoever of any connection between the supposed evolutionary development of any of these creatures.
The evolutionist faces not just one impossible hurdle—that some reptiles grew feathers and began to fly—but two other hurdles. These are that flight evolved again when some rodents (mice? shrews?) developed a skin-like surface on their front legs and developed into bats. Also, quite separately, some insects grew very thin scales to become flies, bees, and butterflies. So here we have feathers, membranes, scales, and even hairs that allow all these different creatures to fly. Why? How? If evolution from a common ancestor is random and unguided, how is this outcome logical?
References:
[2] https://www.nhm.ac.uk/discover/convergent-evolution.html
[3] https://www.nature.com/articles/nature14593
[4] https://phys.org/news/2015-07-single-celled-predator-evolves-tiny-human-like.html
[5] https://australian.museum/learn/animals/molluscs/chambered-nautilus
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