Which mode of transportation is specifically mentioned as operating in the lower atmosphere? Submarine Hot Air Balloon Spaceship

The correct answer is Spaceship.<br /><br />Spaceships are specifically designed to operate in the lower atmosphere, as well as in outer space. They are equipped with the necessary technology and propulsion systems to travel through the air and beyond.<br /><br />Submarines operate underwater, while hot air balloons rely on the buoyancy of heated air to rise through the atmosphere. Neither of these modes of transportation are specifically mentioned as operating in the lower atmosphere.<br /><br />Therefore, the correct answer is Spaceship.