Select the word pair that best completes the following sentence. when a harpsichordist depresses a key, a simple mechanism causes a to a string. select one: column of air; vibrate quill; pluck hammer; strike controller; strum

hi! i may not be much , but here is my answer!

blank 1 is pluck hammer

blank 2 is strum

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).