Why are a variety of instruments needed to measure change in the climate system?
a. a different type of instrument is needed for each different climate.
b. the climate system involves a number of different factors that are measured differently.
c. climate is determined over a number of years, rather than a short period of time.
d. different areas have developed different instruments to measure climate change.

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

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d. fossils found in lower layers of sedimentary rock are older than fossils found in upper layers of sedimentary rock.