Ari ecosystem is not a
A. Open system
B. Closed system
C. Variable system
D. None of these

Hint:-
An open system is characterised as a system in which there is free exchange with the environment of both matter and energy. With the external world, the machine has contact. A close system is characterised as a system where either matter or energy is not exchanged with the surroundings.

Complete answer:
In a closed system, as living organisms, human beings are open structures, thermodynamically speaking. People share matter and energy with their environment to preserve their physical structure. In a closed terrestrial life support system known as the biosphere, humans live. In terms of matter, the biosphere is essentially a closed system, but an open system in terms of resources. The aim is to establish strategies to ensure the biological autonomy of humans when separated from the terrestrial biosphere for spaceflight purposes.

Hence, Option B is the right answer.

Additional Information:
The environment relates to how all these various species live in close proximity to each other and how they communicate with each other. In an area where both rabbits and foxes live, for instance, these two animals are in a partnership where the fox eats the rabbit in order to survive. The relationship with other beings and plants living in the same or similar regions has a knock-on effect.

Note:-
A stranger will kill an ecosystem. A rise in temperature or increase in sea level or climate change could be the outsider. The outsider can impact the natural equilibrium and can disrupt the environment or ruin it. It's a little sad, but man-made practises such as deforestation, urbanisation and natural activities such as flooding, hurricanes, fires or volcanic eruptions have destroyed and disappeared habitats.