1.

Identify X and Y                                                                                                                                          (2015)'X'Organ of respiratory systemIntestineOrgan of 'y' system 

A.  X = Heart;       Y = Circulatory
B.  X = Knee;        Y = Respiratory
C.  X = Lungs;       Y = Digestive
D.  X = Kidney;      Y = Excretory
Answer» D.  X = Kidney;      Y = Excretory


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