fossil fuels make up the biggest percentage of air pollution
Answer:
1.) 36 alien civilizations could communicate with us.
2.) The nearest alien could be on Mars which is 54.6 million kilometers
away.
3.) No I don't agree. There could be millions of alien civilisations out there that we haven't found because space is so big.
Answer: People couldn't find the radio stations.
Explanation:
Every radio station is assigned a frequency on which they are to broadcast. These frequencies identify the radio stations such that people are able to find them by just going to that frequency.
This was the main reason why the government had to assign radio frequencies. Initially, radio stations took on different frequencies and finding them could be cumbersome as they sometimes changed. By assigning one frequency to a station, listeners could always find it there.
