Find something of interest related to biology  AP 2 ( BIOL 2402) and write a min

Find something of interest related to biology  AP 2 ( BIOL 2402) and write a minimum of 3 pages double paced. Sources should be in APA format. 
Among this topic ( Blood , The Heart , Blood Vessels, Lymphatic system & immunity, Respiratory , digestive , Reproduction System) 

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