An artist can show weather in an artwork by using colors, adding, objects, and


a. changing
b. ignoring
c. erasing
d. keeping

A) Changing. If the artist use colors, adding, objects that means he will change something from stuffs that hi's using. I hope this help! 

He developed the concept of linear perspective, and he had the ability to solve architectural problems using mathematics.

The gregorian chant was a major cultural milestone in the middle ages. it was one of the first codified forms of music meant to be played as written, where previously it was difficult to mass-produce and disseminate any music. what's more, these chants were also some of the first examples of musical notation: the notes and bars of today's music sheets are a reflection of centuries of evolution beginning with these chants. it became official throughout the entirety of the catholic church, meaning that nearly all of europe followed this musical notation and styling.