When scar replaces mufasa the pride stable ecosystem is replaced by an unstable ecosystem. describe three ways the movie indicates this change in the ecosystem?

An unstable ecosystem refers to the state of an ecosystem when it loses the tendency to get amend with the environmental modifications. This takes place when the modifications are spontaneous and huge and these variations enhance the capacity or resilience of the ecosystem.  

In the given question, that is, in the movie Lion King, one can witness the change in the ecosystem in three ways at the time when Scar replaces Mufasa as the pride. During the reign of Scar, the food sources started to decline, the water sources started to decline, and the packs of antelope started to move on due to lack of grass. Thus, the stable ecosystem gets replaced by an unstable one.  

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.