Final answer:
Ub Iwerks was not actively involved with both Disneyland and Disneyworld as he had left Disney Studios before the parks were developed; hence, the statement is false.
Step-by-step explanation:
The student's question addresses the involvement of Ub Iwerks in the Disney Corporation's expansion into theme parks. The statement that Ub Iwerks becomes actively involved with both Disneyland and Disneyworld is false. Ub Iwerks was an animator and played a key role in the creation of Mickey Mouse. However, his involvement with Disneyland and Disney World was not significant as he had left the Disney Studio in the 1930s and only briefly returned in the 1940s. He was not associated with the creation or development of the theme parks which began with Disneyland in the 1950s.