Anursing student lists the preventive and primary care services available in schools, primary healthcare provider's offices, occupational health clinics, community health centers, and nursing centers. which service provided by these centers is most expensive?

The most expensive service that centers provide is Disease management.  Disease management is expensive and time consuming, it is expensive because centers needs professional and many researchers found, patients in DMPs tended to get even more prescriptions filled and make more use of more healthcare services than those not in the DMP and more doctors are needed for each clients and patients. 

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genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).