A natural ecosystema.Depends on the man b.Depends on plantsc.Depends on animals d.Is auto operated

A natural ecosystem is a complex network of organisms and the physical environment they inhabit. Let's break down each option:

a. Depends on the man: While human activities can significantly impact ecosystems, natural ecosystems have existed and functioned long before humans. Therefore, they do not inherently depend on humans.

b. Depends on plants: Plants are a crucial part of ecosystems. They are primary producers that convert sunlight into usable energy, which is then transferred through the ecosystem's food web. So, yes, ecosystems do depend on plants.

c. Depends on animals: Animals, including herbivores, carnivores, omnivores, and decomposers, play various roles in ecosystems, such as pollination, seed dispersal, and nutrient cycling. Therefore, ecosystems also depend on animals.

d. Is auto operated: This statement is somewhat true. Natural ecosystems are self-regulating and can maintain balance through processes like predation, competition, and symbiosis. However, this doesn't mean they function without any external influences.

In conclusion, a natural ecosystem depends on both plants and animals and is largely self-regulating. However, it does not inherently depend on humans, although human activities can significantly impact its health and functioning.