The environment plays a crucial role in an organism's ability to fossilize. Which is the best location for fossilization?

A) bottom of a river

B) very dry environments, such as land

C) bottom of a lake covered by sediment

D) an environment exposed to natural elements


True or False: If a geologist found two fossils of different species buried next to each other in a rock layer, he or she might hypothesize that the two organisms may have been alive during the same time period.

A) True

B) False

C) Neither

Fossil A is found in a rock layer above a layer containing Fossil B. Which fossil is probably older?
A) Fossil A
B) Fossil B
C) both are the same
D) can't be determined

What is the half-life of strontium-90?
A) 112 years
B) 84 years
C) 56 years
D) 28 years