Which of the following makes up the largest portion of the hydrosphere? a. air b. the oceans c. the continents d. photosynthetic organisms

The answer would be the Oceans because water makes up a very large portion of the earth in general.

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the oceans makes up the largest portion of the hydrosphere because hydro means water and the oceans are big bodys of water so there for the oceans makes up the largest portion of the hydrosphere

b. the carbon cycle ensures living things have a source of hydrogen

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.