Is it true that the ecosystems are everywhere that living things are found?

Yes, if there was no ecosystem, there would be nothing to sustain an organism for survival

It is true that ecosystems are the names given to a community of living organisms (plants, animals, and microbes) in conjunction with non-living parts of their environment such as air, water, soil, etc. Ecosystems are defined by the relationship between both living and non-living organisms in a given area.