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![Is green the color of silence?](http://www.aucoeurdelarbre.ca/upload/actualites_scientifiques/thumbnail/SMAJ_AS_001_A_MLabrecque1_4.jpg)
Is green the color of silence?
Quebec residents living near highways often have to choose which of their senses will be attacked by the proximity of traffic: their hearing because of the noise, or their sight because of a concrete sound barrier. But what if they did not have to choose?
![What is a tree?](http://www.aucoeurdelarbre.ca/upload/questions_public/thumbnail/SMAJ_QP_001_A_0130_coc2_00012_4.jpg)
What is a tree?
My question is "What is a tree, in general?" I would like to know what makes a tree a tree.