Cell, The basic unit of life, Tissue, A group of similar cells working together., Organ, A structure made of different tissues working together., Organ system, A group of organs working together., Organism, A single living thing., Population, A group of organisms of the same species living in one area., Community, Different populations living and interacting in the same area., Ecosysten, Living organisms interacting with their physical environment., Biosphere, All ecosystems on Earth.

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