Class sizes

I come from a small school of twenty-five students and my mom is concerned about me considering Kansas. I was wondering what the class sizes would be in a biology and any other science class. Thank you!!!

My daughter is a freshman at KU and her Biology class in her first semester had almost 900 students. The Intro courses will be large and lecture based. The class sizes get smaller as you advance but you will need to deal with the auditorium style lectures first.