A book of First Class stamps suhagra 100mg buy online Some scientists explained away this dilemma by claiming that the fossil record is deceptive. Perhaps, they speculated, the first representatives of modern animal groups appeared long before the Cambrian period, but had tiny, soft bodies what were not easily preserved as fossils. But based on fossil evidence, most paleontologists believe the âfuseâ on the explosion must have been short, with new life forms proliferating only a few tens of millions of years before the Cambrian period. Just how quickly would species have to evolve to squeeze in all these new developments? âNo one has actually tried to quantify just how fast the rates were,â says Michael Lee, an evolutionary biologist at the University of Adelaide in  Australia and the South Australian Museum, who led the new research. âThey just literally took Darwinâs word that they must have been pretty fast.â
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