Figure 23.2 a Sediment Core Is Removed from the Floor of an of an Inland

Multiple Choice

Figure 23.2
A sediment core is removed from the floor of an inland sea.The sea has been in existence,off and on,throughout the entire time that terrestrial life has existed.Researchers wish to locate and study the terrestrial organisms fossilized in this core.The core is illustrated in Figure 23.2 as a vertical column,with the top of the column representing the most recent strata and the bottom representing the time when land was first colonized by life.Assuming the existence of fossilized markers for each of the following chemicals,what is the sequence in which they should be found in this sediment core,working from ancient sediments to recent sediments?
1) chitin coupled with protein
2) chlorophyll
3) bone
4) cellulose

A) 2,4,3,1
B) 2,4,1,3
C) 4,2,1,3
D) 4,2,3,1