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1. The product of excretion common to the mammalian kidney, lung and skin is

 
Vitamin E

 Vitamin A

 Vitamin K

 vitamin C

2.

The product of excretion common to the mammalian kidney, lung and skin is?

 mineral salts

 carbon (IV) oxide

 water

 Urea

3.

The organ situated in the pericardia cavity of a mammal is the

 heart

 liver

 stomach

 spleen

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