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If you can persuade your parents to have a roast leg of lamb next weekend - there 's your artiodactyl reference specimen , and your school may have a dog or cat skeleton set up in the lab - there 's your carnivore . The ABH antigens are just 3 of almost 200 oligosaccharide antigens that are found on our cell surfaces , and in addition to the A and B enzymes , there is a host of other enzymes that produce these antigens . They will also eat mollusks , insects , small fish , tadpoles , freshwater snails , fish eggs , and frogs . ( Some of the compounds present in gasoline also contain small amounts of other elements , including sulfur , nitrogen , oxygen , and some trace metals . " The challenges in information technology for an institution of the size and complexity of Penn State are great , " said Morooney .