The correct order of organization is from simplest to most complex is . cell, tissue, organ, organ system.
The cell is the fundamental unit of life, performing basic functions like respiration and metabolism. Tissue is a group of similar cells working together for a specific function, like muscle tissue for contraction. Several tissues working together for a more complex function, like the heart pumping blood.
Multiple organs cooperating for a vital bodily function, like the digestive system breaking down food.