The forest ecosystem can be considered under what ecosystem

These factors threaten north americas ecosystems

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 %.

In russia which of these challenges affects the transportation of both petroleum products and other goods?