Is it possible taht all elements of an ecosystem stay in balance with each other if yes what do wr call such an ecosystem?

Yes, it is possible for all elements of an ecosystem to stay in balance with each other, and such an ecosystem is referred to as a "stable" or "equilibrium" ecosystem. In a stable ecosystem, populations of organisms and their interactions with the environment maintain a dynamic balance, allowing for biodiversity and resilience to disturbances. However, this balance can be disrupted by factors such as environmental changes, human activities, or invasive species.