If you're working on a report for school, you can probably find the answers to your questions by looking through:
Kids & Youth
Visiting Yosemite? Join tens of thousands of other kids by become a junior ranger or little cub! Consider visiting the Nature Center at Happy Isles (summer only) or the Yosemite Valley Visitor Center for interactive exhibits.
History: Junior Ranger history reaches back to the Yosemite Junior Nature School, organized in June 1930 and lasting until 1954. Imagine being an eager young naturalist sent off to the park for a week's summer session. Read a 1937 Yosemite Nature Notes article about the historic school and a 1960 Yosemite Nature Notes article that shares the program's success and structural evolution in 1955. Read about the children's experience in their words in this 1938 Yosemite Junior Nature Notes magazine. [1 MB PDF]. Also, could you pass the Junior Ranger 1933 test? [20 kb PDF] Warning: it's tough!