Lipases are likely to be denatured by highly acidic or highly basic pH. Evidence of this is present in the fact that bile is released into the endothelium where the lipases will act in order to neutralize the stomach acids.
A disturbance would be things like lava, flows, newly formed sand dunes, or rocks left from a retreating glacier. These are disturbances because Primary Successions happen in lifeless areas, which soil is incapable of sustaining life.
Trees would be a renewable resource because we chop down trees and use seeds to regrow them.
