Human sperm cells and egg cells are
a haploid, which containing 23 chromosomes
b haploid each containing 46 chromosomes
c diploid each containing 23 chromosomes
d diploid each containing 46 chromosomes

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Many archeologists and anthropologists disagree with dr. thorne's view.  thorne strongly believes that what many calls "homo erectus"  was in fact  homo sapiens,  and that they migrated out of africa almost 2 million years ago and dispersed throughout europe and asia. that's way different  from what scientists have always believed about the evolution of the species.