Question

which of the following correctly displays the hierarchical levels of organization in multicellular organisms from smallest to largest?
cells → tissues → organs → organ systems → organism
organism → organs → organ systems → tissues → cells
molecules → cells → tissues → organs → organism
rewatch

Explanation:

This question asks for the correct smallest-to-largest hierarchical order of multicellular organism organization. The first option skips the molecular level (the smallest biological unit here). The second option is ordered from largest to smallest, which is the reverse of what is asked. The third option correctly starts with the smallest unit (molecules) and progresses to cells, then tissues, organs, and finally the whole organism.

Answer:

$\boldsymbol{molecules
ightarrow cells
ightarrow tissues
ightarrow organs
ightarrow organism}$