Where did the ancient Greeks build signal towers?, On the coasts, On mountain tops, In cities, In forests, How were messages sent between the towers?, Using birds, By messengers, By lighting fires, Only with smoke, Which sound-based method is still used in Central Africa?, Whistles, Drums, Horns, Bells, How can drums imitate speech?, By hitting them fast only, By producing high and low tones, By drawing marks on the drum, By using colors on the drum, The ancient Greeks built signal towers on mountain tops., T, F, Messages between the towers were sent using birds, T, F, Drum talk is still used in Central Africa today, T, F, Drums cannot imitate speech, T, F.

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