What is an advantage of using nuclear power over natural gas to generate electricity?
A. Nuclear power produces no waste.
B. Nuclear power does not contribute to climate change.
C. Nuclear power produces greenhouse gases.
D. Nuclear power is free.

Which of the following is true about fossils? a. fossils found in lower layers of sedimentary rock are older than fossils found in upper layers of sedimentary rock. b. fossils found in lower layers of sedimentary rock are as old as fossils found in upper layers of sedimentary rock. c. the relative age of fossils cannot be determined from their position in sedimentary layers.