In what situations would you use decantation instead of filtration to separate solids from liquids?

Can you relate the presence of nasal hair to any separation process?

During the COVID-19 pandemic, all of us wore masks. Generally, what material are they made of? What is the role of these masks?

A mixture containing potatoes, salt, and sawdust has been given to you. Outline a stepwise procedure for separating each component from this mixture.