Final answer:
The pro-word that means "This is the end of my transmission to you and a response is necessary" is Over.
Step-by-step explanation:
The pro-word that means "This is the end of my transmission to you and a response is necessary" is Over. When using the word "Over" in communication, it indicates that the speaker has finished speaking and is waiting for a response. This pro-word is commonly used in radio communications or walkie-talkies.