Question

The levels of organizations in multicellular organisms are shown below, but they are not in the correct order. Arrange the levels of organization in order from simplest to most complex.
cells
organs
whole

organisms

tissues
organ

systems

Answer 1

Correct order (simplest → most complex):

cells → tissues → organ → organs → systems → organisms → whole

Note: the standard hierarchy is usually given as cell → tissue → organ → organ system → organism (the “whole”). The entries "organ/organs" and "organisms/whole" in your list are duplicates of the same levels.