Absent students make more work and lead to lower grades and lower graduation rates.
An absent student when back in the class needs additional attention to bring them back to where the class is. Also, extra homework must be developed and graded.
Not attending seems a major cause of lower grades and lower graduation rates. If that needs explaining, let me know. Yet teachers are responsible for this.
It's the parents problem. And some of those are homeless. Hard to get to school when your parents in Eugene have to move to a Springfield motel because they lost their home. And if the school tries to call them? Their phone is disconnected.