Definition: When an organism, or one of its parts, turns or bends away from an external stimuli.
Connection: In this picture you see a snail, usually when you touch a snails eye, the eye will quickly pull back into the snail's body which is an example of tropism.
Sources Cited
"tropism." The American Heritage® Dictionary of the English Language, Fourth Edition. 2003. Houghton Mifflin Company 19 Jul. 2013 http://www.thefreedictionary.com/tropism
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