A good way to teach kids about the capillaries in plants as well as humans and how it all works is a simple experiment using white flowers such as daisies , carnations, or Queen Anne's lace and celery! All you need is some food coloring and water!
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We tried celery and daisies after a few days their petals and leaves changed colors. My 4yr old kept checking them to see if it worked and when it work she ran in announcing with delight. They turned colors mommy, they turned colors.
When it was done we had a little science lesson on veins, and capillaries, and how plants and people work. I've included this scholastic/magic school bus link to help you better explain what is happening!
http://www.scholastic.com/magicschoolbus/simplescience/archive/labs/capillaries.htm or here is another good one as well! http://www.reachoutmichigan.org/funexperiments/quick/celery.html
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