Which of the following is a characteristic of a good index fossil?
a. the fossil closely resembles many other types of fossils.

b. the organism was restricted to only one location on earth.

c. the organism lived only during a short part of earth's history.

Ms. sullivan's class is designing a miniature roller coaster. after first setting it up, they find that it didn't have enough speed to go through the loop de loop. instead of taking out the loop, they decide to increase the height of the first hill the coaster goes down, and this adds the speed needed to make it through the loop. what would be a drawback to this plan in real life? a) no one likes loop de loops. b) there is no downside to this plan. c) a higher hill means a scarier ride. d) a higher hill takes more time and material to build.