2. in which region is there a large deposit of petroleum and natural gas?
a the cascade mountains
b. the gulf coast states
c. the rocky mountains
d. the ohio river valley

Do you guys know all the answers to this

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 %.

The organ that has two atria and one ventricle is the