The traditional “top-down” theory of the formation of our galaxy cannot explain why

Which phase of the cell cycle ensures that identical copies of the dna are made for daughter cells?

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

Prokaryotic and eukaryotic cells are different in many ways other than the presence or absence of a nucleus. if both archaebacteria and eubacteria are prokaryotic cells, then why are archaebacteria more closely related to eukaryotic cells than they are to eubacteria?