1. Why are there numbers by each sentence when you read a reading passage?

The numbers that are next to the sentence tell you what sentence you are reading. Sometimes they have the numbers at the beginning of the paragraphs. They are just there to tell which one you are reading. Most of the time they put the numbers there when you are going to take a test/quiz, that has a question, that you can find the answer in a certain sentence.

explanation:

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martians or other types of aliens represent a unique fear as opposed to zombies. vampires and other types of monsters.   in most sci-fi stories, aliens come from other worlds and have different or more advanced technology.   abductions and experimentation on human bodies that involve these technologies, or the use of these technologies against human beings and the use of unknown "powers", are a type of fear that's different from that of other types of monsters.