Which sequence represents the correct order of levels of organization found in a complex organism?
a. cells → organelles → organs → organ systems → tissues
b. tissues → organs → organ systems → organelles → cells
c. organelles → cells → tissues → organs → organ systems
d. organs → organ systems → cells → tissues → organelles

C is the answer.

Explanation:

Organelles (the smallest in this situation) are what you can find inside a cell (example: nucleus, mitochondria, etc..).

Cells are what make up tissues (such as muscles).

Tissues make up organs (such as the heart) and organs make up organ systems (such as the circulatory system).

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