deinstall ports

Hello all, I'm new user in FreeBSD and have a question about ports.. If a port is depend on others ports, during the deinstall it will deinstall and all dependencies? Many Thanks Best regards "The only fear we have to feat its fear itself". _

libm.so.2 ????

Hi, I've installed opera on my FreeBSD 6.1 from opera*.tar.bz2 with no errors, but I can run it.. /usr/libexec/ld-elf.so.1: Shared object "libm.so.2" not found, required by "opera" help please!!! "The only fear we have to feat its fear itself".