Compared with lower altitudes, at higher altitudes the air molecules are the same density of packing.
more densely packed.
packed with variable density.
less densely packed.

Asimilarity between the governments of israel and iran is that a both are considered democracies b. both are ruled by a prime minister c. both give men and women voting rights d. neither allows political parties to exist

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 %.

Why the moon is not visible from earth during the new moon ?