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Which of the following levels of organization is the least complex?

a. Cell
b. Organ
c. Tissue
d. Individual organism

User Justinf
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Cells are the smallest alive element, tissues are a group of organized cells, organs are a group of tissues that form a complex structure with a special function, organ systems is a group of organs working together to ensure good biological performance, organisms are living things form by an organized collection of systems.
User Demian Flavius
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