Telephones are used for communication by two people by transmitting what? 
Transmitting illness. chemical messengers encoded information electromagnetic energy Television. Communication degree. Mechanical waves. Electrical energy
A B C D E F G H
Sound Sound waves are mechanical waves.
Telephones are used for communication by two people by transmitting mechanical waves. 
Telephones are used for communication by two people by transmitting what?  (A) Transmitting illness. (B) chemical messengers (C) encoded information (D) electromagnetic energy (E) Television. (F) Communication degree. (G) Mechanical waves. (H) Electrical energy