An 'Ornithopter' Was A Predecessor Of What Type Of Transport?

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Difficulty
Medium

An ‘Ornithopter’ Was A Predecessor Of What Type Of Transport?

Question:
An 'Ornithopter' Was A Predecessor Of What Type Of Transport?
a)
Submarine
b)
Bicycle
c)
Helicopter
d)
Aeroplane

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Correct Answer
Aeroplane
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