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

TissuesTissues are made of a group of similar cells that work together to do a specific job in the body..

OrgansOrgans are made up of two or more tissues that work together to do a specific job.

Organ systemsAn organ system is a group of organs working together to perform particular jobs.

OrganismsSum of all cells, tissues, organs and organ systems makes an organism. An organisms is made when a group of organ systems work together.

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