What is a jarls, Karl's and thralls in Viking history please write in a short sentences

and this is a second question if you can do it

Vikings became raiders because...

please write in PEEL graph ​

The history of the Vikings is something that draws millions of visitors to Norway every year in order to see things like the Viking Ship Museum. Although it is possible to see fictionalized accounts of Vikings in numerous TV shows and movies, a great opportunities to actually learn about the Vikings is to book a fjord tour in Norway and visit some of the historic sites they once ruled.

Explanation:

Jarls were the leaders, karls were just ordinary citizens and thralls were the slave class of citizens.

definitely a for sure. ill see and update if i get the answer

i am not 100% positive but i think it is is b. both are non-partisan jobs

i am pretty sure that members of congress have term limits, can be impeached, and are nominated through direct popular vote.