Organisms contain different levels of organization within their bodies. Arachnoidiscus ehrenbergi, pictured, is a single-celled organism that is part of the group of algae known as diatoms. Which level of organization is seen in both Arachnoidiscus ehrenbergi and the human stomach?

Arachnoidiscus ehrenbergi is a single-celled organism, so it has the level of organization called a cell. The human stomach is an organ made of tissues and cells, so cells are also part of its organization. Tissue, organ, and organ system are not levels found in a single-celled organism.

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