A would be the correct answer because but has a comma has it before it.
Answer:
Not Practical and not Possible
Explanation:
Signals are used whenever voice communication is not practical and not possible.
Speech signals are transmitted using telephone channels. The voice signals are transferred using the telephone set to the local telephone exchange and then to the receiving party.
In electronics and telecommunications, the signal is described as any electromagnetic wave or current that transfers information.
Answer:
He goes to the lake to get a drink of water, and he sees something bright sticking out of the middle of the lake. No, it's not Excalibur. At first he can't figure out what it is, but then he realizes that it's the tail of the plane. The tornado somehow flipped the plane around and raised the tail up in the water.
Explanation:
