The chart below is a taxonomic key for the fictitious insect genus Problematica. To which species does the insect in the picture belong?
Select one:

A. Problematica differensis
B. Problematica brancus
C. Problematica cantrellis
D. Problematica alva

Peat deposits are found in waterlogged places where dead plant material piles up. when peat is buried, it undergoes compaction. it is subjected to heat and pressure for a long time, and a lot of water is squeezed out during this process. nearly ten vertical feet of original peat material becomes one vertical foot of coal. which of these remains unchanged in the system during the conversion of peat to coal? a) area b) density c) mass d) volume