The diagram below represents an incomplete sequence of levels of
organization.
organelles → tissues → organs → organ systems → organism
This sequence can be completed correctly by inserting
(a) “cells →” between organelles and tissues
(b) “proteins →” between tissues and organs
(c) “populations →” between organs and organ systems
(d) “molecules →” between organ systems and organisms

Dear student, 
Please find below the solution to the asked query        

The sequence can be completed by inserting 'cells' between organelles and tissues. Hence, option (a) is correct.
The sequence would be- Organelles, cells, tissues, organs, organ systems, organism.

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