Give two example each, ob Moldes of transport used on land, water and air.
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Substances which themselves are not catalysts, but when mixed in small quantities with the catalysts increase their efficiency are called as promoters or activators. Catalytic poisons : Substances which destroy the activity of the catalyst by their presence are known as catalytic poisons. ...
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Busses and wheel carts are two examples of transport modes used on land. Boats and ships are two examples of transport modes used on water. Aeroplanes and helicopters are two examples of transport modes used in air.
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