A very substantial disappearance of organisms from the geologic fossil record provides evidence for which of the following events?
:
1) periods of mass extinction
2) a change in sea level
3) continental drift
4) a change in climate

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 is not an example of a  cultural  bond found in a nation-state? a. a holiday traditionb. a common religionc. a favorite placed. a shared history

Which of the following is evidence to the past existence of glaciers?