Total number of oxygen atoms in carbon dioxide and water
There are 5 levels of body organisation, which include, cell, tissue, organ, organ system and organism. The cells together make up the tissues; the tissues together make up the organs. The organs make up the organ system, and the organ system make up a complex organism.
The human stomach is made up of tissues. It is an organ. Arachnoidiscus ehrenbergi also shows an organ level organisation.
So, the correct answer is Organ.
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