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| style="height:20px; width:200px; text-align:center;" |A very old adult is called an 'elderly' person.
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===Organ Systems===
: Organ systems are groups of organs that work together to do a specific job.
: Humans have a number of organ systems including:
*[[Muscular System]]: Allows us to move.
*[[Skeletal System]]: Supports our bodies.
*[[Digestive System]]: Gets nutrients from our food.
*[[Circulatory System]]: Transports oxygen and nutrients around the body.