Do undergraduates, masters and doctors all have thesis defense?
On the whole, yes. However, there may be exceptions for undergraduate courses. On the one hand, the requirements for undergraduate courses are not strict, especially for ordinary or bad universities. On the other hand, the expansion of school enrollment leads to the uncoordinated ratio of teachers and students, the shortage of teachers and the large number of students, which makes it impossible for every student to reply. Both master's and doctoral dissertations should be defended.