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In addition to these native functions , some pathogens make use of these same antigens to infect our cells , and some people think that terminal glycosyl groups like the A and B antigens evolved to mask the H antigen from pathogens that recognized it . The question you have asked is a really interesting one , and I like the way it arose . They have large rows of very rough grinding teeth , with very pwerful jaw muscles , so that a large proportion of the plant cells are burst , releasing the nutrients within , before they are swallowed . This does not work like the column example given before , instead the DNA has to " find its way " through the agarose . In a country like the US where there has been racial mixing for many generations , it is even more difficult to make such determinations with confidence and most forensic scientists would not attempt to do so from bones . In fact , some people lack the enzyme that synthesizes the H antigen in saliva and on some skin cells . In large countries like the US or Australia , it probably even varies from region to region . Gravitational forces would be non-symmetric , which would mean that they would end up sliding along the wall of the tunnel as they passed near the center of the Earth . The low temperature group will take the gum out of their mouths and roll it into a cylinder of a given diameter ( use small ruler ) , then they 'll drop the cylinder into ice water for 30 seconds . The female builds a nest of cat-tails ( Typha ) and other vegetation near the edge of a shallow pond , marsh , or lake .