<Tr> <Td> Super-cellular level (Multicellular level) </Td> <Td> Tissue </Td> <Td> Functional groups of cells </Td> </Tr> <Tr> <Td> </Td> <Td> Organ </Td> <Td> Functional groups of tissues </Td> </Tr> <Tr> <Td> Organ system </Td> <Td> Functional groups of organs </Td> </Tr> <Tr> <Td> Ecological levels </Td> <Td> Organism </Td> <Td> The basic living system, a functional grouping of the lower - level components, including at least one cell </Td> </Tr>

The most comprehensive level of biological organization is the