Answer:
Hydrosphere
Explanation:
The wording is quite confusing but if you are talking about the 'spheres' of earth's bio-systems, then the answer should be: The part of Earth that is liquid water is called the <em>Hydrosphere</em>
The mitochondrion is the structures found in eukaryotes but not found in prokaryotes. It is known as the powerhouse of the cell, the function of these structure acts like a digestive system, it generates large quantities of energy in the form of adenosine triphosphate. It is found in the cytoplasm of eukaryotic cells.