SamCogar Posted July 25, 2018 Posted July 25, 2018 Excerpted comments from cited source, to wit: https://phys.org/news/2018-05-gene-survey-reveals-facets-evolution.html Quote Title: Sweeping gene survey reveals new facets of evolution "Viruses, ice ages, successful new competitors, loss of prey—all these may cause periods when the population of an animal drops sharply," he told AFP, commenting on the study. "In these periods, it is easier for a genetic innovation to sweep the population and contribute to the emergence of a new species." Such silliness. If a species is flourishing then its members are spread far and wide over a large area as solitary individuals ….. or as pairs ….. or in small groups, packs, etc., ……. or in different herds, flocks, etc. of a great number of individuals ……. and thus natural calamities as noted above, when they occur, do not affect all members of the same species equally. Quote But the last true mass extinction event was 65.5 million years ago when a likely asteroid strike wiped out land-bound dinosaurs and half of all species on Earth. This means a population "bottleneck" is only a partial explanation at best. A likely asteroid strike, ……. HUH? Atmospheric CO2 has always been at the tippity-top of the food chain for all life forms inhabiting the surface of the earth. And dinosaurs evolved to be the largest land animal ever with the plant-eating dinosaurs being the largest …….. and the meat-eating dinosaurs being 2nd largest land animals because they were feeding (preying) on the plant eaters. And dinosaurs became big and fat and dominated the earth beginning about 252 million years ago when atmospheric CO2 ppm averaged around 2,000 ppm and up to 3,000 ppm at 200 mya before it started “dropping like a rock” to below 1,000 ppm at 65 mya …….. when the dinosaur die-off (extinction) began. To wit: https://static.skepticalscience.com/pics/nova_past_climate1.gif It t’wasn’t an asteroid strike that wiped out the dinosaurs, ….. they simply starved to death for lack of food. Or lack of sufficient food (CO2) for plant growth, …... iffen you prefer. -1
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