True: Birds can create lift by flapping their wings or gliding., Airplanes need to have more lift than weight to take off., Birds like vultures use warm air currents to stay in the air without flapping., False: Humans were able to fly without engines by copying birds., Parasitic drag is caused by the air being pushed down by the wings.,

Taking Flight

Табло

Визуален стил

Опции

Шаблон за превключване

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