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| − | A growth response to the tooth.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia | + | A growth response to physical touch.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia |
| − | Educational Ministries, Inc. 1998</ref> | + | Educational Ministries, Inc. 1998</ref> An example of this is ivy growing up walls or tendrils following and coiling around existing support structures. |
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