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1. Cell
2. Tissue
3. Organ
4. Organ System

Nervous

Excretory

Muscle Tissue

Immune

White blood cell

Kidney

Bone

Smooth muscle cell

Neuron

Nerve cell

Circulatory

Nervous tissue

Red blood cell

Connective tissue

Reproductive

Lung

Brain

Stomach

Cheek cell

Heart

Digestive

Respiratory

Epithelial tissue