Whats the similarity between biosphere and ecosystem

Ecology is differentiated into the organization levels initiating with the biosphere, ecosystems, populations, communities, organism, matter, cell, and an atom. The region enveloping the earth and supporting life is called the biosphere. The biosphere comprises various ecosystems. The ecosystem refers to a biological community of associating species and their physical surrounding.  

The similarity between an ecosystem and a biosphere is that they both exhibit organisms that rely on each other and associate.