'Baptized' in the Bible

Hath the Christ been divided? was Paul crucified for you? or to the name of Paul were ye baptized;

and all to Moses were baptized in the cloud, and in the sea;

for also in one Spirit we all to one body were baptized, whether Jews or Greeks, whether servants or freemen, and all into one Spirit were made to drink,

Seeing what shall they do who are baptized for the dead, if the dead do not rise at all? why also are they baptized for the dead?