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spec: When a worker encounters a hazardous chemical or biological material , physical agent , or physical hazard during employment through any route of entry ( e.g ., inhalation , ingestion , skin contact , or absorption ) . This pipeline will be developed in stages . And this time it 's a good thing . They gradually abandoned the hunter-gatherer way of life , began to live in permanent settlements , and began to practice agriculture . If you ever get a chance to examine a developing hen 's egg , try ' candling ' it . 1998 ) ] . Bird bones are actually hollow ( air filled ) in the living animal , presumably for lightness , but air also circulates within their skeleton and may assist with respiration . Allowing individual students to sign up into rooms ties up bed spaces and makes it difficult to match and assign roommates to rooms . Secondly , you may want to remove all minerals if you are marketing a product to children . In the United States , however , higher education is controlled mostly at the institutional level through internal efforts to monitor quality and by accreditation – a mostly non-governmental process for external accountability . Secondly , when you blow air out under pressure , its temperature falls as it expands . Vendaria works with manufacturers to create short video clips of how a product works . It 's like having years of film school packed into each and every day .