Yes. Some people are sensitive to resins from some woods. It is not common but it is possible.
ANS 2 -Yes, it can, - Red Cedar is particularly bad for this.
you can wear safety glasses when sanding and cutting wood.
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Medium sandpaper is best for sanding wooden furniture.
A sanding block is basically just a small piece of wood or other material covered with a sanding belt or sand paper.
Sanding or planing.
construction
If it's a wood deck, then sanding is the best option. Pressure washing will damage the wood which will have to be repaired by sanding. Also, if the coating has a tenacious bond, pressure washing will not get ir all up. The rest will need to be removed either chemically, or mechanically by sanding.
fungi cause them
physical
Yes, it is a physical change.
Fungi can rot wood, spoil food, and cause skin diseases such as ringworm.
Yes, they can, but are not as effective as good sandpaper.