The basic structural unit of all living organisms.

A group of cells with a similar structure and function.

A group of interconnected tissues that work together to perform a specific set of functions.

A group of organs that work together to carry out a specific task.

A living thing that portrays the basic characteristics of life.

Smallest component of an element that has the properties of that element.

Smallest component of a substance that has the properties of that substance.

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Levels of Organizati

Term	Definition
Cell	The basic structural unit of all living organisms.
Tissue	A group of cells with a similar structure and function.
Organ	A group of interconnected tissues that work together to perform a specific set of functions.
Organ System	A group of organs that work together to carry out a specific task.
Organism	A living thing that portrays the basic characteristics of life.
Atom	Smallest component of an element that has the properties of that element.
Molecule	Smallest component of a substance that has the properties of that substance.