7. Which animal species lived for the shortest amount of time? 8. Which time periods only had one species of animals present?
9. Let’s say you want to find a fossil
of a ray-finned fish. In the picture
of rock layers below, which rock
“formation” or “member” would
be the best for you to start digging
in?
10. What is the first formation or
member would you be able to find
jawless fishes in?

Karen is waiting by the lockers before school for her friend richard. they had agreed to look over the history review sheet together to be ready for the test later that day. richard shows up late with uncombed hair and wrinkled clothes. karen: "you're five minutes late and you look like a wreck! " richard: (slams his locker) "you know, i don't have time for this." karen: "fine! figure out the test on your own! "