存 be aware of

Naruto was aware of his SON, a child.

to exist ★★★★☆
存 (be aware of) + 在 (be real) = 存在 (to exist)

depend ★★★☆☆ NP
依 (depend on) + 存 (be aware of) = 依存 (depend)

to depend on- usually in a bad way, like "America's dependency on foreign oil"

preserve ★★☆☆☆
保 (guarantee/maintain ) + 存 (be aware of) = 保存 (preserve)

preserve - usually used with traditional culture or morals more than environmental causes. You'll often see this: 保存員会　（ほぞんいんかい） preservation committee.

the existing XXX ☆☆☆☆☆
既 (already) + 存 (be aware of) = 既存 (the existing XXX)