18. a) Reusing an item would be taking the same item and using it more than once for the same task whereas recycling is when an item is put into a different shape or form to be used as a different item entirely though made of the same substance.
b) Reusable: water bottle, lunch boxes Recycle: newspaper, cans
19. a) Hydrogen, Nitrogen, Soil, Water
b) Petroleum, Gold, Silver, Wood
20. a) reusing
b) recycling
c) reusing
21. Both newspaper and lightbulbs can be recycled, but lightbulbs cannot be reused for different purpose whereas lightbulb have to go to a manufacturing factory to be economically helpful.
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