question:
Radio transmitters and receivers are used to convey signals (information) in systems including broadcast (audio) radio, television, mobile telephones, Wi-Fi (WLAN) data networks, trunk lines and point-to-point communications links (telephone, data networks), satellite links, many remote controlled devices such as garage door openers, and wireless remote sensors, among many others.
What is one system that uses electromagnetic waves?

answer: yes

question:
Costs of flocking include bullying of socially subordinate birds by more dominant birds and the reduction of feeding efficiency in certain cases.
What is a cost of flocking?

answer: yes

question:
In January 1968, a few weeks after the devaluation of the pound, Prime Minister Harold Wilson and his Defence Secretary Denis Healey announced that British troops would be withdrawn from major military bases East of Suez, which included the ones in the Middle East, and primarily from Malaysia and Singapore.
When did Britain withdraw from the Maldives?

answer: no

question:
She, in turn, offered them a message stick, as a gift of peace and welcome.
What did Agnes Shea give to the Chinese in return?

answer:
yes