Oswald Avery helped build our understanding of genetics by showing that: A viruses cannot infect cells.
B. DNA transformed bacterial cells.
C traits cannot be inherited.
D. proteins move between bacterial cells.

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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).