Living things (organisms) are organized to accomplish their basic needs of reacting to stimuli, growing and developing, using energy, and reproducing.
Animals and plants are organized from cells-->tissues-->organs-->organ systems-->organisms.
There are numerous organ systems that help us live!
Try out some of the following activities to learn more about them.
http://www.kineticcity.com/controlcar/activity.php?virus=nastro&act=4
http://www.bbc.co.uk/science/humanbody
http://www.brainpop.com/science/diversityoflife/humanbody
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