Which era lasted the longest in earth's history?
precambrian
paleozoic
mesozoic
cenozoic

Brian's school locker has a three-digit combination lock that can be set using the numbers 5 to 9 (including 5 and 9), without repeating a number. the probability that the locker code begins with a prime number is %. the probability that the last digit of the locker code is an odd number is %.

India's population is made up of percent hindus.

Where is the vascular system located