What type of muscle is responsible for contractions of the digestive tract and arteries? what type of muscle is responsible for contractions of the digestive tract and arteries? smooth muscle skeletal muscle striated muscle voluntary muscle cardiac muscle?

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).

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