Question

which level of organization includes all the other levels of organization?
organ system
organism
tissue
cell

Explanation:

In biological organization, a cell is the basic unit. Tissues are made of cells. Organs are made of tissues. Organ systems are made of organs. An organism is made of organ systems. So an organism includes all the other levels (cells form tissues, tissues form organs, organs form organ systems, and organ systems form an organism).

Answer:

organism