Stomata open and close in response to- A. water being pumped in and out of guard cells.
B. crystal formation in the plant due to excess glucose.
C. lack of available sunlight during the night.
D. stimulation by auxins producing rapid growth

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