Answer:
h - height
Explanation:
gravitational potential energy = m * g * h
m stands for mass. Mass doesn't change in physics
g stands for gravitational acceleration. It is a constant.
h stands for height. When the skater moves up and down the track the height from the ground changes. Therefore this variable does change.
A biological community of interacting organisms and their physical environment.
A fire is one because it doesn’t matter if zero squirrels are in the forest or none fire will still burn with or without the squirrels
B. Upwelling brings cold nutrient rich water to the surface and boosts aquatic life
I am not 100% sure but I thinking it responds when pathogens enter the body because the immune system is meant to protect your body from illness.
