Who said that the ultimate principle of the state should be, “from each according to his ability, to each according to his needs”?

Which groups of people most directly benefited from song innovations in the song dynasty‘s open border policy?

Select the phrase that best describes "race."a. religiously distinct b. different species c. socially constructed d. factually accurate

Science cannot describe things that a.) are beyond imagination, experience, or human ability b.) cannot be observed, measured, or tested c.) have not been conclusively proven d.) occur without being seen, heard, or felt