Homeostasis is the maintenance of a constant internal state in a changing environment.

The cell is the basic unit of structure and function of a living thing.

Tissues are made of the same type of cells grouped together to do a specific job.

Organs are made up of different tissues that work together to do a job.

An organ system is a group of organs working together.

Sum of all cells, tissues, organs and organ systems makes an organism.

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Scientific Vocab

Term	Definition
Homeostasis	Homeostasis is the maintenance of a constant internal state in a changing environment.
cell	The cell is the basic unit of structure and function of a living thing.
Tissues	Tissues are made of the same type of cells grouped together to do a specific job.
Organs	Organs are made up of different tissues that work together to do a job.
organ system	An organ system is a group of organs working together.
Organisms	Sum of all cells, tissues, organs and organ systems makes an organism.