It is interesting to reflect on what prevented the resurgence of dinosaurs from this base. To answer this question — or ask a new one — email lastword newscientist. Questions should be scientific enquiries about everyday phenomena, and both questions and answers should be concise.
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Shock waves would have triggered earthquakes and volcanic eruptions. The resulting darkness could have lasted for months, possibly years. Many dinosaurs would have died within weeks. The carnivores who feasted on the herbivores would have died a month or two later. Overall, the loss of biodiversity would have been tremendous. Only small scavenging mammals that could burrow into the ground and eat whatever remained would have survived. The iridium layer plus the Chicxulub Crater were evidence enough to convince many scientists that the bolide impact theory was credible.
It explained much of what previous theories could not. Paleontology remains a competitive discipline even though its central mystery appears to have been solved. Agreement over dinosaur extinction is far from unanimous, and fossils continue to be found that add to the body of knowledge about how the dinosaurs lived and died.
Only recently have birds been identified as descendants of the dinosaurs, and theories regarding dinosaur intelligence and behavior continue to change. The climate change theory still holds sway over some scientists, who refute that the Chicxulub impact was the sole cause of the extinction.
Evidence from the million-year-old lava flows in India hint that a giant, gaseous volcanic plume might have initiated global climate change that threatened the dinosaurs. But if you see something that doesn't look right, click here to contact us!
Subscribe for fascinating stories connecting the past to the present. The prehistoric reptiles known as dinosaurs arose during the Middle to Late Triassic Period of the Mesozoic Era, some million years ago. As part of the study, which appeared in the Proceedings of the National Academy of Science PNAS , an international team of scientists re-examined previously tested animal fossils from Neanderthal-era sites in southern Iberia modern-day Spain , a region believed to have been one Neanderthals are an extinct species of hominids that were the closest relatives to modern human beings.
They lived throughout Europe and parts of Asia from about , until about 40, years ago, and they were adept at hunting large, Ice Age animals. An ice age is a period of colder global temperatures and recurring glacial expansion capable of lasting hundreds of millions of years. Thanks to the efforts of geologist Louis Agassiz and mathematician Milutin Milankovitch, scientists have determined that variations in the Denisovans are an extinct species of hominid and a close relative to modern humans.
Denisovans may have ranged from Siberia to Southeast Asia during
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