The level of organization in Spirogyra and Volvox is cell.
Spirogyra is a type of green algae that consists of long, thin, spirally coiled filaments. Each filament is made up of many individual cells.
Volvox is a type of green algae that forms spherical colonies. The colonies are made up of many individual cells that are organized into a multicellular structure.
Both Spirogyra and Volvox are examples of organisms that are made up of individual cells. They do not have tissues or organs, which are structures made up of multiple cells that perform specific functions. They also do not have systems, which are groups of organs that work together to perform a particular function.