What is the main difference between the two layers of the mantle?

What is the theme of "the story of the fisherman"?

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 %.

Which anatomical feature would you expect to find in the fossil remains of a nocturnal species?