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