This is not a complete question, so it cannot be answered. All living thiings respond to something.
microbiologist
niche
niche
energy
I think it is privations
You could be thinking of evolution
restricted in habitat
carbon and hydrogen
IDK
They obsorb all the nutrients from dead orginisms
insect orginisms that dwell in the mud or soil.
an ecosyestem is an biological environment consisting of all the orginisms living in a perticular area