Science Trek Trees

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=oROGLBRmB2E

Trees are the oldest, tallest and heaviest things on Earth. How do they grow and survive? Why are they essential to life on our planet? Brian Jorgenson, B...

Tree (Ontology Class), science, education, Science Trek, Idaho Public Television, Joan Cartan-Hansen, leaf, needles, roots, Plant (Organism Classification), Wood
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