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1. Vocab: Biological Hierarchy

AB
AtomThe smallest unit of matter; the basic building block of all substances.
CellThe basic unit of life; the smallest structure capable of carrying out all life processes.
TissueA group of similar cells working together to perform a common function (e.g., muscle tissue).
OrganA structure made of different tissues working together to perform specific tasks (e.g., heart, lungs).
Organ SystemA group of organs that work together to carry out a major body function (e.g., digestive system, circulatory system).
OrganismAn individual living thing that can carry out all life processes (e.g., a bacterium, a tree, a human).
PopulationA group of organisms of the same species living in the same area at the same time.
CommunityAll the populations of different species living and interacting in the same area.
EcosystemAll the living organisms (community) plus the non-living environment (soil, water, climate) in a given area.
BiomeA large region defined by its climate, plants, and animals (e.g., desert, rainforest, tundra).
BiosphereThe highest level of organization; includes all ecosystems on Earth, the regions of land, water, and atmosphere where life exists.
MoleculeA group of atoms bonded together; can form simple compounds (like water) or biological molecules (like glucose).


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