Question

choose the correct answer. the largest and most complex structural units of the complete body would be: the body systems. the tissues. the organs.

Explanation:

To determine the largest and most complex structural units of the body, we analyze the levels of organization: cells → tissues → organs → organ systems. Tissues are groups of similar cells, organs are groups of tissues, and body systems (organ systems) are groups of organs working together. Since organ systems integrate multiple organs and perform major body functions, they are larger and more complex than tissues or individual organs.

Answer:

the body systems.