A cotton fibre of 180 millitex has a density of 1.5 g/cm³ and an average perimeter of 40 µm. The average area of the cell wall (µm²) is

A cotton fibre of 180 millitex has a density of 1.5 g/cm³ and an average perimeter of 40 µm. The average degree of thickening of cell wall is approximately

Inhaling the smoke from a burning _________ could _________ you quickly.