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Anonymous
Anonymous asked in Science & MathematicsBiology · 2 months ago

If evolution is driven gradual change, why do we keep finding biological explosions/radiations then stasis?

example: 

Cambrian explosion

Avalon explosion

Great Ordovician Biodiversification Event

Cretaceous Revolution

Devonian Nekton revolution

Carboniferous explosion

Jurassic explosion

They suddenly exploded and then nothing, explosion then nothing, explosion/nothing, what gives evolutionists? Why the lack of consistency? 

7 Answers

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  • 1 month ago

    Firstly there isn't a consensus, some such as Hutton and Lyell supported gradualism and others do not. Dr. Gould for instance supported punctuated equilibrium, which is precisely what you are describing, long periods of stasis punctuated by brief periods of evolutionary growth. Further still are those like Cuvier who support catastrophism, the belief that sharp bursts of evolutionary change follow in the event of catastrophe.

    The other issue of course is that what you describe as a "sudden explosion" was only brief on a geological scale. The Cambrian explosion, for example, took place over a span of 13-25 million years. The oldest known Homo sapiens are only a few hundred thousand years old, so we are talking about a "sudden" explosion that lasted upwards of 100 longer than human beings have existed.

  • CRR
    Lv 7
    1 month ago

    Two Reasons Why a Bad Theory Remains Popular, Granville Sewell, March 2, 2021

    The talk, and the video, looked at the two main reasons why Darwinism, an extremely implausible theory which becomes even more implausible with every new biological and biochemical discovery, is still so popular in the scientific world today. 

    https://evolutionnews.org/2021/03/two-reasons-why-...

    Bad as the theory is, it remains the best materialists can offer.

  • 1 month ago

    Oh!  You've put your finger on something!  Evolution is false because it doesn't satisfy your need for consistency.  Maybe a part of the problem is that you've just absorbed "facts" that suit your preconceived beliefs.  Evolution has proceeded faster during some periods in the earth's history than in others, but there have never been periods of general "stasis."

    UDATE:  For further entertainment, consider reading an answer by a guy who lives in la la land (see above).  He cites an "expert" in evolutionary biology who has no academic credentials in any scientific discipline.

  • 2 months ago

    As with many things those you list are not appropriately named. Take the Cambrian explosion, which describes a period of 13 to 25 million years, which is rather slower than the name implies.

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  • Zirp
    Lv 5
    2 months ago

    the change is in chances of survival of different fenoypes.

    Sometimes a sudden change (epidemic, vulcanic eruption, big meteorite) wipes out an entire fenotype in a short time, or even several entire species

  • 2 months ago

    Your question is the problem here.  You seem to be starting from a conclusion and working backwards.  I'm not even sure what you are trying to ask other than you're trying to be critical of something that is well understood and widely accepted. 

  • Dixon
    Lv 7
    2 months ago

    We like to  think of things as being linear and steady but in fact pretty much everything is only ever linear over a limited range and then there are "catastrophes" at some boundary of behaviour. So, it isn't always the gradual change that Darwin originally thought. When circumstances change rapidly, evolution (or extinction) responds rapidly too. The form of a species is basically an active dynamic system and as such it is capable of many responses depending on the input stimuli.

    But specifically, the Cambrian Explosion may have happened to due the increase of oxygen in the atmosphere or the chemical composition of seawater changing.

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