Part C: Multiple Choice Write the letter corresponding to the best response in the blank. Place the letter of your choice in the space provided. DO NOT CIRCLE your answers 25. A collection of organs working together comprises a/an- A. Tissue B. Organism C, Organ Systems D. Organ 26. Which of the following lists best illustrates the idea of increasing levels of organization? A. cells, tissues, organ systems, organs B. tissues, cells, organs, organ systems C. organs, organ systems, cells, tissues