Scientists classify an element based on what criteria? Select one:
mass number

atomic number

atomic symbol

atomic mass

please help!

a. by using fur or clothes to trap heat energy near the body

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).

ya the other dude is right