Process:  - An owl leaves his nest - The owl flys out into the night - The owl looks down at the ground - The owls keen eyesight allows him to see in the dark - The owls sensitive hearing allows him to locate hidden prey - The owl swoops down - The owl catches a mouse in his talons.  Perturbation hypothesis: suppose there is a blight on trees happens, how will it affect there are less places for owls to nest.  Does the supposed perturbation have an effect (direct or indirect) on the process?
Answer:
yes