In terms of chromosomes, which of these cells is different: nerve cell, skin cell, sperm cell, bone cell?

Sperm cell is haploid - it has half the number of chromosomes.

Answer in 2009 barack obama signed into law the family smoking prevention and tobacco control act, the new law (h.r.   1256) represents the most sweeping action taken to date to reduce what remains the leading preventable cause of death in the united states;