2.Originally, scientists classified
organisms into five kingdoms based, in part, onstructure
a. cell
b. family
c. organ

answer; i believe its echoic memory,it is believed to last three to four seconds; good luck

there’s no image attached but i can if you want: )

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).