Which is visible to the naked Which is visible to the naked eye? A. atoms B. chemical bonds C. attractive forces D. substances that atoms make up

Option D

Explanation:

Substances that are made up by atoms are big enough to be seen with a naked eye. Attractive Forces, Chemical Bonds and Atoms are Either seen by light microscope or electron microscope.

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).