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More works of this kind are needed if we are to get a true grasp of the magnitude and extent of the endangered language issue . Moreover , she defines which are the different levels which play a role in a cognitive pragmatic account of the representations and processes required in the interpretation of an utterance . Morris v. Much of the MEOC 's and Maier 's position evokes a " slippery slope " argument , i.e ., that if Sam 's Club is allowed to prohibit its employees from wearing facial jewelry on the basis that it believes its customer base expects an overall conservative appearance in its business , what could come next is that a business might decide its customers are offended by the appearance of employees of color , or that its customers only want to see large-breasted female employees . IAN WILMUT , professor and Head of the Department of Gene Expression and Development at the Roslin Institute near Edinburgh , Scotland , is uniquely qualified both as a pioneer in the science of cloning and as a participant in the public discussions of its possible social and ethical consequences . In large species only half or less of the adults die each year . We have yet to learn how the initial conditions for evolution came about — why we have 23 pairs of chromosomes and at which level evolution operates are only two of the things we do n't understand .