Whose work does da Vinci reference in his notes with this sketch? help failing

Fred has put his clay figurine in a kiln to set soon it will be time to remove the figurine from the figurine from the kiln what should he do

The author of the article, leanne cole, shares two photos that she took. she concludes that only the first one, the home built in the 30's, could be considered 'fine art'. why do you think that is?

Organum was first developed by religious singers adding another melody directly above the chant and mirroring the chant line. true false