Can you help answer the following unity questions?

1.Why is object hierarchy important for animation? Explain.

2.Unity audio engine allows multiple different types of files to be utilized in it. Why do you think Unity considered providing support for different file types instead of fixing it to MP3 or WAV? Explain.

3.Unity provides a lot in terms of animation. Why do you think a curve editor, such as the one in Unity is a nice module to have in a game engine? Explain its uses.