Answer:
Organ system level
Explanation:
The respiratory system is an organ system as it is composed of organs with related functions, such as the lungs and trachea.
Level 4: Organ Systems
One example is the digestive system, which is made up of many organs that work together to digest and absorb nutrients from food.
The organ level of organization is when two or more tissues work together for a specific function. For example, the bladder consists of an inner lining of epithelial tissue, bound by various connective tissues to (smooth) muscle.
The major levels of organization in the body, from the simplest to the most complex are atoms, molecules, organelles, cells, tissues, organs, organ systems, and the human organism.
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