What are the two main reasons synchronized sound, specifically dialogue, was difficult early on?

Make the correct match. 1. only the collection of the louvre is on display. 2. in addition to being a museum, the louvre has also been a 3. the present palace was built to display 4. after the french revolution, it became a 5. in 1989 i.m. pei designed for a new entrance. 6. pei's design actually has 7. the new entrance was required to handle the growing number of half the royal art collections public museum 673 panels the glass pyramid prison visitors

What is the angular extent of an image captured by a camera called?

The painting entitled, the old testament trinity, is an example of. art ?