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What did hydrogen used to be used for?
The only answer that comes to mind is "Airships". Hydrogen, the lightest element, was used in airships, where excess weight was undesirable. However, accidents like the Hindenburg disaster showed...
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Where is democracy used Where is monarchy used Where is republic used Where is oligarchy used?
Democracy is used in America and some other countries Monarchy is used in China, England and other countries
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Why is a model airplane used and where it is used?
A model aeroplane is used for presentations and testing. Model planes are also used for fun. They are used model-plane clubs, aeroplane company headquarters and studios. (Bedroom, in my house)
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What is used for fungi used on pizzas?
Porcini, baby portabello, and regular white mushrooms are common pizza toppings.
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Who used Runic symbols and what were they used for?
The ancient Germanic tribes and the ancient Scandinavians used runes as an alphabet. Prior to that, they used runes for magic purposes, such as casting lots (divination) and spells of protection.