While students in traditional laboratories are kept busy performing numerous "cookbook" exercises during each laboratory period, students in investigative laboratories are spending more time on mental operations.
(students in traditional laboratories; are kept; ) (students in traditional laboratories; performing; numerous "cookbook" exercises; T:during each laboratory period) (students in investigative laboratories; are spending; more time on mental operations)
students in traditional laboratories students in traditional laboratories students in investigative laboratories
are kept performing are spending
numerous "cookbook" exercises T:during each laboratory period
more time on mental operations