2537. Why would these characters live in a tree house? 葉 枝 幹 花 根

They are all parts of a tree.  

葉  YOU, ha - leaf, foliage

枝  SHI, eda - branch

幹  KAN, miki - main part, trunk

花  KA, hana(su) - flower

根  KON, ne - root, perseverance, origin