Which factor allows earth to hold onto liquid water
a. presence of living things
b. lunar tides
c. moderate temperatures
d. lack of gravity

Why did macarthur want to invade china? why did truman oppose 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 %.

What is the border between layers a through f and layer g called?