Cells, Tissues, Organs and Systems
All living things are made up of Cells
A group of Cells e.g. Heart Muscle makes up a Tissue e.g. Heart Muscle Tissue
A group of Tissues makes up an Organ e.g. Heart
A group of Organs makes up a System e.g. Circulatory System
A group of Systems make up an Organism e.g. Humans
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