Discuss in 3 ways in which wood is commercially important

Well one way is that they can advertise using paper made from redwood trees or any other kinds. Another way is that for wood flooring in your home people may advertise a strong oak plank to be laid across your dinning room. The final way is for furniture because you wouldn't want a weak chair or bed frame made out of weak wood, you'd want made out of a strong type of wood.

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this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

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