Read the following text. Underline the passive voice in the text.The History of Animated Movies

Animated movies have changed a lot over the last 100 years. Winsor McCay is considered the father of animation. In the early 1900s, McCay animated his films by himself. He drew every picture separately and had them photographed, one at a time. Hundreds of photographs were needed to make a one-minute film. Sometimes, it would take him more than a year to make a five-minute cartoon, In 1914, the development of celluloid (a transparent material) made animation Picture of Walt Disney easier. Instead of drawing each picture separately, the animator could make a drawing of the background, which remained motionless, while only the characters moved. Walt Disney took animation to a new level. He created Mickey Mouse, added sound and music to his movies, and produced the first full-length animated film, Snow White and the Seven Dwarfs. Many people think he was a great cartoonist, but he wasn't. Instead, he was a great story editor and clever businessman who had other artists do most of the drawings.​