How do you determine if an animal is more evolved than another?

I am comparing squids and starfishes and need to figure out how to determine which of the two is more evolved.

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  • D50
    Lv 6
    1 week ago

    You're not talking about your boyfriend, are you?

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  • Anonymous
    1 month ago

    Count their brain cells.

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  • 1 month ago

    "More evolved" is meaningless. 

    A squid, a starfish, a sweet potato, and me have had the same evolution time: roughly 3.8 billion years since the earliest trace of microorganisms. 

    However, we can safely decide if a species is well "adapted" or not to its current environment: the woolly mammoth was well adapted to ice age climate (it is not anymore! ). 

    Both squids and starfishes are doing well in their today world because they  evolved some amazing features:

    - squids reproduce fast, swim fast, some species can even jump over the waves, all can hide behind a cloud of ink, and the biggest can fight sperm whales. 

    - star fishes can open a clamshell and grow a new arm when necessary.

    Some people like to think H. Sapiens is "more evolved" because we are good at long distance running and intelligence.

    It's like setting the rules after the match and claiming they win!

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  • Who
    Lv 7
    1 month ago

     there is no such thing as "more" evolved cos evolution does not have  a direction

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  • 1 month ago

    The question implies that evolution is an conscious or directed force, which it isn't.  Evolution is just whatever works, works, and whatever leaves more copies of itself is the thing that persists.

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  • 1 month ago

    That's a BS question put forth by someone who knows little about evolution. I suspect that what your teacher means is "more specialized". If you want to put your head on the chopping block, ask your teacher "Which is more evolved, a highly specialized animal or that animal's internal parasite, found nowhere else?"

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  • Zirp
    Lv 7
    1 month ago

    evolution doesn't have a direction.

    If need be, I guess you can compare how long it takes for a zygote to develope into a fullgrown individual

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  • 1 month ago

    "More evolved" is too nebulous a concept to be useful in science.

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  • 1 month ago

    If the squids and starfish can survive and flourish in their environment then they have fully evolved. Now if their environment changes then they may have to evolve some more to continue to exist. Evolution responds to the external world. There is not some internal clock that tells a living thing to change. 

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  • Anonymous
    1 month ago

    All life tracing back to a single origin is therefore all evolved exactly the same amount. The various kingdoms, phyla, classes, orders, families, and species are the result of differentiation through evolution but the quantity of evolution for all is exactly the same, no more, no less.

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