Scientists have long been torn about the exact evolution of birds since fossil and molecular dating techniques have yielded different answers. But by studying the DNA of birds in the parrot and cockatoo families, which do not migrate like most other birds, researchers were able to discern the times of species divergence and concluded that "parrots are an ancient lineage without any close evolutionary relationships," according to ScienceBlogger Grrl Scientist.
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Comments
Swing and revolving gates are installed in the areas of low traffic flow where thorough control is not required. It is also used as exit path in case of emergency in combination with the system of turnstiles BR2.
Posted by: bramki obrotowe | December 29, 2008 4:35 AM
Bi-directional turnstiles series BR2 are designed for personal control systems in supervised places indoors and outdoors applications. Currently, in Poland over 600 various firms and buildings: airports, government buildings, ambassies, military and police buildings, power plants, swimming pools, ski lifts etc. use our turnstiles.
Posted by: bramki obrotowe | December 29, 2008 4:40 AM