Viruses are not cells.
Viruses viruses are the smallest agents of disease.
The smallest agents of disease are not cells.
Cells do not include
[a] harmful substances
[b] sulfate particles
[c] the smallest agent of disease
[d] direct damage to the lungs
[e] sub-units of species
[f] Inches or fractions of inches.
[g] Something with a head, thorax, and abdomen
[h] Direct sunlight.