8 Organelle

5 Organism

6 Tissues

7 Cell

9 Atom

2 Ecosystem

6 Organ system

1 Biosphere

3 Community

4 Population

Explanation:

organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.

Atoms  

Molecule Groups of atoms

Biomolecular complex Groups of (bio)molecules

Sub-cellular level Organelle Functional groups of biomolecules, biochemical reactions and interactions

Cellular level Cell Basic unit of all life and the grouping of organelles

Super-cellular level

(Multicellular level) Tissue Functional groups of cells

Organ Functional groups of tissues

Organ system Functional groups of organs

Ecological levels Organism The basic living system, a functional grouping of the lower-level components, including at least one cell

Population Groups of organisms of the same species

Community

(or biocoenosis) Interspecific groups of interacting populations

Ecosystem Groups of organisms from all biological domains in conjunction with the physical (abiotic) environment

Biome Continental scale (climatically and geographically contiguous areas with similar climatic conditions) grouping of ecosystems.

Biosphere or

Ecosphere