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originally posted by: 5StarOracle
a reply to: MarioOnTheFly
Well they used to say Archaeopteryx was the first bird... but there's a little bird wing in amber there...
Dating from the same period...
Remember evolution needs a long long time to transpire that's why we don't see it happening...
lol
originally posted by: Barcs
originally posted by: 5StarOracle
a reply to: MarioOnTheFly
Well they used to say Archaeopteryx was the first bird... but there's a little bird wing in amber there...
Dating from the same period...
Remember evolution needs a long long time to transpire that's why we don't see it happening...
lol
Holy ignorance, batman!
originally posted by: veracity
a reply to: dr1234
I had no idea birds were dinosaurs
I cannot stop staring at the amber, it is amazing.
Crocodiles are built to last. Evolving around 200 million years in the Mesozoic epoch, crocodiles have far outlived the dinosaurs.
In fact, crocodiles are more closely related to birds than they are to snakes and lizards [source: University of California Museum of Paleontology].
So what does all of this classification have to do with whether crocodiles came from dinosaurs? Alongside birds and other flying reptiles, dinosaurs are lumped into the Ornithosuchia branch.
The loss of teeth in favor of a beak is not an uncommon occurrence. For example, the ornithomimids and oviraptors are two types of toothless dinosaurs, but in both groups the primitive members are toothed. Why they lost their teeth is not known.
Beaks can also occur with teeth. Stegosaurs and ceratopsians both had beaks and teeth, with no evidence of any reduction in teeth.
The lead scientist of the identification effort, Jørgen Olesen of the University of Copenhagen, suggested that they represent "an early branch on the tree of life, with similarities to the 600 million-year-old extinct Ediacara fauna."[12] At least three genera of Ediacarans—Albumares, Anfesta, and Rugoconites—share similarities with Dendrogramma; all three appear to have possessed a disc with an internal network of forking channels.[5]
Because you use that term it leads me to doubt your statement. There is no theory of macroevolution.
I used to accept the theory of macroevolution wholeheartedly
There is no requirement in the theory of evolution for any particular rate of change. It depends upon the rate of mutation and the rate of change of the environment (which includes competitors). The coelcanth didn't change much either, over a much longer period of time.
My curiosity wonders why such ancient creatures did not hardly evolve at all (if even at all) for hundreds of millions of years while all these others supposedly evolved rapidly in comparison by ridiculous bounds.
Because you use that term it leads me to doubt your statement. There is no theory of macroevolution.
Macroevolution is evolution on a scale of separated gene pools.[1] Macroevolutionary studies focus on change that occurs at or above the level of species, in contrast with microevolution,[2] which refers to smaller evolutionary changes (typically described as changes in allele frequencies) within a species or population.
The process of speciation may fall within the purview of either, depending on the forces thought to drive it. Paleontology, evolutionary developmental biology, comparative genomics and genomic phylostratigraphy contribute most of the evidence for the patterns and processes that can be classified as macroevolution. An example of macroevolution is the appearance of feathers during the evolution of birds from theropod dinosaurs, when now viewed at a distance from the future, although as they arose the developing changes would be deemed microevolution.
Use of the term is most common in the continental European traditions (as Dobzhansky, Mayr, Rensch, Goldschmidt and Schindewolf were) and less common in the Anglo-American tradition (such as John Maynard Smith and Richard Dawkins). Hence, use of the term "macroevolution" is sometimes wrongly used as a litmus test of whether the writer is "properly" neo-Darwinian or not.[6]