The level of the organization is the part to hold the relationship between the basic unit till the whole organism. The picture shows the organ level of the organization. Thus, option D is correct.
What is the level of organization?
Level of an organization defines the structural framework of the organism that constitutes the organelles, cells, tissues, organs, organ system, and organism. The kidney represented in the diagram is an organ made of various tissues that ultimately make the excretory system.
Therefore, the picture shows an organ.
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