The correct answer is the ocean.
Processes must be in place to aid the environment in returning to its initial condition following a disturbance in order for it to be called stable. An ecosystem with a variety of food chains and biotic interactions is likely to exist in areas with a high level of biodiversity and genetic variation.
Mountains are formed and destroyed by a variety of manmade and natural factors.
Deserts may also be destroyed by natural disasters, hence they are not regarded as stable ecosystems.
Forests cannot be considered to have a stable environment since they may be destroyed by fire or the process of deforestation.
Since it doesn't change throughout time, the ocean is a stable environment. Oceans have not changed over the course of the planet's vast existence. Small changes in the oceans are difficult to observe because of their enormous magnitude.
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