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Molecule import for life
Ex : proteins, carbohydrates, lipids

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One part of an organ system

Ex : Heart , kidney

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Several organs working together

Ex : Respiratory system , Cardiovascular system

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A small part inside of a cell

EX: nucleus, the mitochondrion,

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Smallest unit of life

blood cell, nerve cell

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A living thing

EX: Human , Animals , Plants

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Smallest unit of matter

EX: contains atoms