4. TREES AND PEOPLE ARE SIMILAR IN MANY WAYS, YET DIFFERENT IN OTHER WAYS
Animal cells have thin boundaries . Tree wood cells have thick, tough boundaries or walls . Animal tissue will not support itself . Animals require skin and bones to keep the cells in place. Every splinter of wood  is self-supporting (139,146). Cell walls of wood are made of cellulose, lignin, and hemicelluloses (73,159)
Thin boundaries on animal cells allow them to move. Animals move away from agents and situations that threaten their survival. Trees cannot move. Trees-grow where they find themselves, adapt,' or die: Trees planted incorrectly in the wrong places are committed to an early death at the time of planting (156,317).
[Source SHIGO 1991 MODERN ARBORICULTURE pg26]
SOURCE SHIGO 2002 CD's
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