Dobro i sta sad? Kada nemas sta da kazes ti se vredjas... Ovoj gluposti nikad kraja... Kao sto rekoh demantovao si velike evolucioniste koji su se prikazivali na B92... Sto bih izmislio onakvu glupost??? Mada mislim da evolucionisticka teorija jeste najveca glupost... Odatle i one glupe ideje... A ti sto je prihvatas i prihvatas to da su po toj teoriji puzevi nastali od valjkastih crva i NA koji nacin... A poso i sam vidis da je glupost, ubacujes novu ideju na neki nacin u evoluciju...
Ko si ti da menjas neke teorije? Mislim daj filozofe, necu vise da pricam sa tobom, kada nemas sta da kazes vredjas se...
OBRAZLOZENJE ZA SVE! Lepo sam citirao Puzevi su nastali od valjkastih crva zato sto im se nagomilavala hrana na ledjima... Ako prihvatas ovu glupost, kao sto je prihvatas, ja nemam sta da pricam ovde vise
Udahni ti malo, obrisi penu oko usta pa sedi i napisi nesto pametno.
" Nothing Says "Early Earth Was Cool" Like World's Oldest Diamonds
The zircon in imitation diamonds proves the best way to preserve more than four-billion-year-old versions of the real thing
By David Biello
Earth is roughly 4.5 billion years old, but her early eons were tempestuous. Not even rock survives from the first 500 million years of her life—an eon known as the Hadean—because geologists speculate the planet's surface boiled and bubbled with molten lava under a steady bombardment of comets and meteorites. But tiny diamonds discovered in antediluvian zircon crystals sprinkled in three-billion-year old rocks from Australia hint that the planet's surface fire might have ceased much earlier than previously believed.
Mineralogy graduate student Martina Menneken of the Westfälische Wilhelms–University of Münster in Germany and her colleagues probed 1,000 of these ancient zircon crystals for inclusions—tiny outcroppings of other minerals hidden in the unusually stable lattice. They discovered diamonds of different shapes and sizes in 45 of the old crystals by using a laser technique called Raman spectroscopy.
"The biggest [diamond] we found was about 60 microns [(roughly 0.002 inches, or 35 times smaller than the head of a pin)] but some only were about seven microns," Menneken says. But their sizes or shapes notwithstanding, all of the diamonds are unique, she adds, because they come from zircon grains that can be dated (via the decay of uranium impurities into lead) to as long ago as 4.25 billion years, a scant 250 million years after Earth formed.
Zircon crystals can form in a number of ways—on the moon, for example, the mineral crystallizes in the wake of a meteorite impact. But some geologists suspect, based on minerals and oxygen isotope levels in the current grains, that they crystallized in an ancient crust that formed from cooling granite magmas. Yet diamonds only form when high pressure squeezes graphite into exquisite clarity—more than 45,000 bars of pressure only found at depths of 100 kilometers (62 miles) or more below the surface.
Image: THORSTEN GEISLER AND ALEXANDER A. NEMCHIN
MICROSCOPIC BLING: The largest of the world's oldest diamonds, bigger than the few micrometers version pictured here nestled inside its zircon case, is still 35 times smaller than the head of a pin.
"Options are shock, bolide [meteorite] impact or burial" for how the diamonds formed, says geologist Ian Williams of The Australian National University in Canberra. "The key question is whether the zircon grew around the diamonds or the diamonds grew in the zircons."
Because zircon crystals can survive even the dissolution of their host rock by weathering, it is possible that the grains formed in the surface rock, which then disappeared below newer surface rock before resurfacing as their latter hosts' outer layers wore away. The researchers are searching for other signs of the history of these grains, such as coesite, a dense form of silicon dioxide created under similar pressure. "We might have had coesite that is totally transformed to quartz now," which is relatively common in the grains, Menneken says. Because coesite is "not stable at surface conditions."
"According to our findings, probably the early Earth might have been a quiet, cool, habitable place," Menneken says. But more research is needed to say for sure, she notes, such as studies of the carbon isotopes and nitrogen content of the diamonds to determine how long the little gems experienced extreme pressures and temperatures.
"A likely explanation is that the diamonds were formed from graphite inclusions in the zircons during an event when the zircons were buried. If that was so, then the burial must have postdated the youngest zircon in which a diamond was found, about 3.1 [billion years ago]," Williams says. But "if the zircons grew around diamonds as early as 4.2 billion years ago, this implies that there was a very thick crust on the Earth by that time." And that means the early Earth may have cooled sufficiently for a host of other adornments, including life."
A evo ti jos malo da se igras recima jer koliko primecujem da umes samo da umisljas sto se drasticno razlikuje od reci RAZMISLJAS.
" Nine fossilised teeth found in Ethiopia are from a previously unknown species of great ape, Nature journal reports.
The 10 million-year-old fossils belong to an animal that has been named Chororapithecus abyssinicus by an Ethiopian-Japanese team.
This new species could be a direct ancestor of living African great apes, say the researchers.
The finds from the Afar rift, in eastern Ethiopia, raise questions on current theories of human evolution.
The researchers say the fossils from Ethiopia probably belonged to an ape from the gorilla family.
Evolutionary divide
Based on genetic evidence, gorillas and humans were thought to have split away from a common ancestor about eight million years ago.
The 10-million-year age of the fossils led the research team to suggest that the split must have happened earlier than 10.5 million years ago.
If correct, molecular and DNA studies will need to be revisited.
The fossils were found at a site in eastern Ethiopia's Afar rift
The team's claims that the teeth belong to a member of the gorilla family stem from similarities with teeth of modern gorillas.
They carried out cutting-edge 3D analysis of the molar tooth's structure and found that both gorillas and the new species had a unique specialisation for eating fibrous foodstuffs such as stems and leaves.
"It's a subtle distinction, but we've compared it with everything we could think of," said Dr Suwa from the University of Tokyo and a member of the research team.
"And it does show some telling signs of gorilla-like molar structure. If it's not a gorilla relative, then it's something very similar to what an early gorilla must have looked like."
Vegetarian tastes
Gorillas are unique among modern and fossil large-bodied apes in having molars that are specialised for shredding fibrous vegetation. The reason for this is that large-bodied gorillas depend on stems and leaves as an important part of their diet.
Not everyone agrees with the team's conclusions, however. Professor Peter Andrews, from London's Natural History Museum, commented: "It is stretching the evidence to base a time scale for the evolution of the great apes on this new fossil."
Professor Andrews believes the structures found on the teeth could be related to the diet of the animal.
He added: "These structures appear on at least three independent lineages of apes, including gorillas, and they could relate to a dietary shift rather than indicating a new genetic trait."
Fossil record
What is not in doubt is that the find itself is impressive.
"The ancestry of humans is increasingly well known, but the fossil evidence for the evolution of our closest living relatives, the great apes, is almost non-existent," Professor Andrews explained.
"It is really exciting therefore to find a fossil ape from this time period - about 10 million years ago - since there is only one other fossil ape known from this time, the more complete Samburupithecus."
The find also supports data that suggests Africa was the origin of both humans and modern African apes.
The teeth were discovered in a region that is about 170km (110 miles) east of Addis Ababa.
In an area of the Oromiya National Regional State, there are exposed patches of sediments that are 10 to 11 million years old, putting them in the Miocene Epoch. Hence, they are known as Miocene Chorora Formation.
The name of the ape is taken from the geological formation Chorora and the former name of Ethiopia, Abyssinia.
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, а на бајке и измишљотине о еволуцији заборави, тако нешто не постоји.
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