Which ecosystem contains 32% of the world's producers?
a. terrestrial ecosystem.
b. freshwater ecosystem.
c. aquatic ecosystem.
d. marine ecosystem

Plzzzzzz me someone this is my last chance on this test i cant fail again

Which of the following expressions is equivalent to -1/4y - 2 1/4 + 1/2 (4-2y)? a. -3y + 2b. -3 1/2+4c. -4 1/2y+2d. -4 1/2y+2show ur work

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 %.