Naraoia
Apprentice Biologist
Species, race, breed, the terms are irrelevant. What is important is the variation itself, not the labels we stick on it.See what I mean..already going around in circles.
You say "By the way by the way: do you mind if I hazard a guess as to why early horse/tapir ancestors look superficially more tapir-like than horse-like?'"
You see this kind of comment will get us nowhere. What is observed is huge variety in many species such as mankind, dogs and horses. Yet they are not only the same kind they are also the same species, despite the differences. Evolutionists have to use words like race and breed to cover over would ultimately be 'different species' if found in strata only a few millions years old. The strawman is obvious.
Whatever is your point anyway? Yes, dogs (one biological species) show more morphological variation than many entire genera. Yes, if we found modern dog breeds as fossils, we'd likely classify them into dozens of species - if not genera. Is this huge amount of variation somehow supposed to disprove evolution?
Given your propensity to latch onto any sort of disagreement in the scientific community, I'm sure you are aware that "species" is hardly a well-defined, universal constant of nature.
Nope, that's for the fossils. Do you seriously expect hyraxes to turn into, I don't know, elephants, over the duration of recorded human history? I think your sense of scale needs some calibration, then.Changes in beak size and colour do not demonstrate how some Hyrax type creature became a horse and rhino at all...
I don't even know what this means....and neither does the allele frequency changes prevalent in an adaptive expression of genes.
Variety supports limits to adaptation?What is observed in breed and races supports huge variety in the same kind and even species. Dog breeding and what we see in nature today supports limits to adaptation.
Species become extinct they do not waddle back to the sea and many are not adapting fast enought to survive climate change no matter how fit they are, and nor will humans with rising oceans.
(1) Fitness is context-dependent.
(2) Fitness in one environment doesn't equal adaptability. In fact, specialisation can be detrimental to adaptability. (Example: polar marine fauna. Brilliantly adapted to near-freezing seas, often die if you heat them up even slightly. If their habitats started warming [ha-ha...], they'd be much less likely to last long enough to adapt than a generalist with greater thermal tolerance.)
(3) Saying that species go extinct therefore evolution didn't happen is kind of nonsensical. If evolution from protocells to dragonflies did happen, you wouldn't classify all the steps as a single species, would you?
Quite true. Not all of earth history is catastrophes, though.Catastrophes support the lucky not the fittest.
No. Your point?Do you think some of mankind will split off and become mermaids in time with rising oceans?????
"The horse" being Equus caballus.The point is this...
The fossil horses aligned from right to left in the front of the display represent the evolution of horses as a steady progression along a single pathway -- until recently a widely held view of evolution. Here the horse is seen to evolve in a neat, predictable line, gradually getting larger, with fewer toes and longer teeth.
Those arranged (also from right to left) in the back present a more current scientific view of evolution, determined through a method of analysis called cladistics, which has shown evolution to be a more complex, branching history, much like the genealogical history of your own family.
There were other horse lineages that didn't survive into the present? Horse evolution was not a linear march of progress towards one and only one goal?
I still don't understand why that is supposed to shock me or invalidate evolution.
How does the existence of other horse lineages falsify the evolution of genus Equus from small, many-toed, forest-dwelling creatures?While evolutionists offer any evolving scenario to align with whatever you find that falsifies your previously 'irrefuteable evidence' for horse ancestry, I'd say you are wasting your time and are only offering flavour of the month.
If only it were that easy.Evolutionary researchers never let observation or science get in the way of a great story.
Homoplasy and convergence do not make sense except in the light of evolution. Don't rely on concepts you don't believe inThere are many traits that are homoplasic and convergent.
Best, but not the onlyMammary glands are the best identifier of a mammal. Fossils cannot demonstrate this.
I cannot, other than making an argument from extant phylogenetic bracketing. And neither can you, or anyone, support it unless they find a stem-amniote with fossilised hair or something.However since you mentioned hair, let's just take a look at just what suggests that hair is actually a mammalian trait.
From the Cover: Identification of reptilian genes encoding hair keratin-like proteins suggests a new scenario for the evolutionary origin of hair
"Our data show that cysteine-rich α-keratins are not restricted to mammals and suggest that the evolution of mammalian hair involved the co-option of pre-existing structural proteins."
It is assumed that the 'common ancestor' had this a-keratin but did not express it as hair. Can you please refute these statements: The supposed common ancestor of lizards, chickens and humans had hair this is why e-keratins are present in such distant species and retained in mankind, and could not possibly be homoplasic.
Having one of the genes for making hair doesn't mean squat, by the way. Hair is not just cysteine-rich alpha-keratins, it's a whole developmental program deployed in a specific context. Does having distal paired appendages patterned by inverse collinear expression of posterior Hox genes mean your ancestors had hands and feet? This was only discovered in fish a few years ago, after all! And it's not just one gene, it's a whole battery of them expressed in a specific way!
Heck no. And bony skeletons fossilise rather better than hair.
That's the difference between having some genes for a trait and having a trait.
I missed the part where hair keratin implies a hairy Ur-amniote.Therefore hair means nothing as far as being an indication of inclusion in the clade of mammals, unless the common ancestor of humans and lizards was also a mammal.
Yes? (Your point?)Lizards, chickens and humans have this e-keratin for Hair. The story goes that these were expressed more strongly in the digits in lizards. Do whales have this e-keratin? Have a guess.
It doesn't need a single hair. It merely needs to be demonstrably descended from animals with it.Of all whales only some have hair. So can you please define for the forum just how much hair one needs to have to meet the criteria of mammal?
It's that pesky "cladistics" thing you brought up WRT horses. You do understand what clades are, don't you?Can you also explain why the whales that do not have hair are still classified as mammals.
Loudmouth, you still crack me up. Great to come back to this after my extended Christmas break
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