Which iconic 1950s sci-fi film, known for its groundbreaking special effects, featured a monster created from a prehistoric plant that was awakened by atomic testing?

Which iconic 1980s sci-fi film, known for its groundbreaking visual effects, was originally conceived with a drastically different plot involving sentient plants?

What iconic animated film, released in 1994, features a soundtrack that includes songs by Elton John and Tim Rice, with Hans Zimmer providing the score?