Attening class

Almost all people attend university. Some people always attend class but some people do not attend. It's their choice. I think people should always attend classes.
First, to attend or not attend can affect class's atmosphere. A class's atmosphere is very important. One student can affect the atmosphere. When one student does not attend, they ca feel empty so it can affect the atmosphere, so students have to attend.
Second, to attend and to not attend can affect a classes progress. When one student didn't come to class, that student doesn't know and asks the teacher and the class can not study very well. So, it can affect the class's progress. For example, a student doesn't come, so a teacher has to answer and answer.
I think students should attend class. This is because when students don't attend class, it can affect a class's atmosphere and classes progress. I hope that people always attend university classes.