Air, water, weather, temperature and other organisms.
Need the levels of organization in the question to sort them!!
Answer:
The changing variables are: v and KE
Explanation:
Given

Required: What changes?
From the formula above:



m: The mass of the skater is constant.
v: Moving up and down the track may change the velocity of the skater.
KE: When velocity changes, the kinetic energy also changes
So:
The changing variables are: v and KE