Which describes a similarity between abiotic and biotic factors? A. They may include things that where once living. B. They are both necessary for organisms to survive. C. They are not usually important parts of the environment. D. They can be easily replaced if they are used or destroyed.

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