Cutting down vast tracks of rain forest may result in which of the following effects on the environment?
loss of biodiversity
stabilization of the soil
increase of biodiversity
decrease in flooding

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 %.