Sperm cell is different from these cells because sperm cell contains 23 chromosome while nerve , bone and skin cell contain 46 no. of chromosome.
Sperm is a male reproductive cell which is haploid and contain 23 no. of chromosome because it is produced by meiosis cell division.
Bone , nerve and skin cell are diploid in nature because they are produced by meiosis division thus contain 46 no. of chromosomes.
Hence, the correct answer is Sperm cell.
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