Which ecosystem is the least stable?

A. A patch of lichens on bare rock

B. A rain forest on a small island

C. A savanna on a large volcanic island

D. A vast coral reef in a warm ocean

Most likely  C

Explanation:

The volcanic activity makes it a dangerous envoirment for animals and natives living there. I think this will help! :

answer; i believe the correct answer to the above question is ( friction)

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.