1) ----- of our body is made up of water a) 75% b) 81% c) 71% d) 85% 2) nitrogen is present because ------ a) control burning b) filled in bulbs c) humidy d) supports burning 3) argon is a) supports burning b) used in photosynthesis c) colorful gas d) filled in bulbs 4) water gets mixed with various substances called ------ a) gases b) impurities c) metals d) mixtures 5) following is not a property of air---- a) air exerts pressure b) occupies space c) it is not a compound d) it has weight

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