http://digfir-published.macmillanusa.com/pol2e/pol2e_ch32_1.htmlCirculation553e8d88757a2ee120000000
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http://digfir-published.macmillanusa.com/pol2e/pol2e_ch32_2.htmlConcept 32.1: Circulatory Systems Can Be Closed or Open553e8d88757a2ee120000000
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http://digfir-published.macmillanusa.com/pol2e/pol2e_ch32_3.htmlConcept 32.2: The Breathing Organs and Systemic Tissues Are Usually, but Not Always, in Series553e8d88757a2ee120000000
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http://digfir-published.macmillanusa.com/pol2e/pol2e_ch32_6.htmlConcept 32.5: The Blood Transports Oâ and COâ553e8d88757a2ee120000000
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