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Multicellular organisms have five levels of organization ranging from simplest to most complex. The simplest level is the cellular level. This is an image of one type of cell found in your body: a cheek cell. You are the most complex level: you are an organism. List the five levels of organization, from simplest to most complex. Describe each level with one or two sentences. Give an example at each level.

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Kalahira
1. Cellular- One cell composed of molecules and organelles. A neuron is a type of cell 2. Tissue- A group of cells form a tissue. Smooth muscle tissue is an example of a tissue 3. Organ- A combination of tissues that form a discrete entity. The heart is an organ 4. Organ system- A group of organs that work together to perform a function. The respiratory system is an organ system. 5. Organism- A combination of organ systems that come together to make a living being. A human is an organism.