Gearboxes allow you to change gears in your vehicle so as to get the most efficient use out of the motor. Nature’s gearbox does the same, but it does not link engine to wheels.
निसर्गातले गिअरबॉक्ससुद्धा हेच काम करतात पण ते इंजिन आणि चाकांना जोडत नाहीत.