6. 'To which level of biological organization does the picture belong? A. Cell B. Organ C: Organism; D. Organism 7. Which is the correct sequence - from the lowest to highest - of the levels of organization in an organism? A. Cells ->Tissues. Organs Organ systems Organisms Population Community Ecosystem Biosphere B. Cells - Tissues --> Organg Organ systems Organisms Community - Population Ecosystem -Biosphere C. Cells.- Organs Tissues Organ systems Organisms Population Community Ecosystem -Biosphere D. Cells - Tissues - Organs systems Organ Organisms - Population Community Ecosystem Biosphere 8. Which of the following units is the highest level of biological system? A. Biosphere B. Community C. Ecosystem D. Population 9. Which of the following statements is TRUE? A. Groups of organs working together are called cells. B. Groups of cells working together are called tissues. C. Groups of organs working together are called organisms. readed cals.