The hierarchies could be: 1) Elements; C, N, O, H, etc., 2) Biomolecules; amino acids, nucleotides, simple sugars, etc., 3) Macromolecules; proteins, carbs, etc., 4) Metabolism; glycolysis, photosynthesis, Calvin Cycle, etc., 5) Cells; plant cells, muscle cells, liver cells, etc., 6) Organisms; saguaro cacti, javelinas, glia monster, etc., and 7) Sonoran desert.
I hope this helped and Merry Christmas!