Atom - Smallest unit of matter, Simple Molecule - Two or more atoms, Macromolecule - Large complex molecules, Organelles - Cell structures with functions, Cell - Basic unit of life, Tissue - Group of similar cells, Organ - Collection of tissues, Organ System - Group of organs, Organism - Individual living entity, Population - Same species in area, Community - Different species together, Ecosystem - Community plus environment, Biosphere - All ecosystems on Earth, Biome - Large ecological area, Species - Group of similar organisms,

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