1. Which best describes an organ system? A. It is made up of similar cells.
B. It is made up of similar tissues.
C. It is made up of different organs
D. It is made up of different organism.

2. Which of the following is composed of tissues that come together to perform a specific function?
A. Cell
B. Organ
C. Organ system
D. Organism

3. Which of the following is a group of similar cells that perform a particular function?
A. Organ
B. Organ system
C. Tissue
D. Organism

4. What is the simplest level of organization in a organism?
A. Organ
B. Organ system
C. Tissue
D. Cell

5. An organ system is a group of organs which .
A. Are made of similar cells
B. Are made of similar tissues
C. Is a specific part of the body
D. Work together to perform interrelated function