Does anyone know what kind of rock this is? Thank you!

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 the following diagram, four different index fossils are labeled: which of the labeled fossils comes from the oldest organism? a b c d

What is the difference between the formation and characteristics of intrusive igneous rock and extrusive igneous rock?