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Typically , in all non-bacterial and non-viral organisms , introns evolve much faster than exons because mutations to introns have little functional significance . Little is known of their biology , though some are known to weave spacewebs . Ancient gilded pagodas sprinkle the landscape ; the enormous Ayeyarwady River cuts through the middle of the country , unconstrained by dams and levees ; jungle-clad mountains form a continuous , horseshoe-shaped barrier around the country , isolating it from neighboring India , China , and Thailand . Staff and associates of the Department of Ornithology and Mammalogy are actively involved in many different areas of scientific research around the world . Started in the summer of 2002 with one San Francisco area school and several California Academy of Sciences high school interns , the project is now working with six classes of students at five schools around the Bay Area . was able to drag in a horizontal direction along a smooth table twelve reels of cotton , a pair of scissors , a screwdriver , a key , and a knife , weighing in all no less than 17 oz . This movable structure works against a fixed horny jaw in the roof of the mouth . In all cases the first name , middle initials , if any , and surname should be used . Within seconds the venom molecules begin to destroy tissue around the wound . Venom proteins , after all , take energy to make . The extremely long lateral spinnerets spin sheets of silk used in prey capture : the spider circles rapidly around the prey tying it down with silk . In all cases , the account symbol or other appropriate reference which clearly identifies the appropriation or fund affected must be shown in the accounting classification space on all basic vouchers .