If there are only 100 seats for the members on the sinking boat, I will give positions to some of them:
8 seats - the people with great importance in certain field (e.g. the biologist who invents the antibody of a certain virus; the historian who discoveries an ancient city site; the physicist who finds the way to a new planet.)
10 seats - the cooks who cook food for the people on the lifeboat everyday.
6 seats - the fishermen who are good at fishing and getting food from the sea.
3 seats - psychologists who can comfort people when they face difficulties.
5 seats - doctors who treat patients when they are not feeling well.
5 seats - cleaner who tidy up the room everyday.
1 seat - reporter who writes down the whole event.
1 seat - photographer who records their life by taking photos.
3 seat - musicians who play music to entertain people.
3 seats - linguistics to communicate with strangers when the boat lands on an island.
4 seats - policemen to keep people safe.
8 seats - navies who are skillful at traveling on a boat.
7 seats - armies who are ready to fight when people face danger in a new place.
3 seats - explorers who are experienced in field survival.
3 seats - tailors who make clothes and blankets for people.
3 seats - technicists who are able to send signals for help on the sea.
4 seats - engineers who are good at fixing the ship.
3 seats - leaders who manage the whole group.
5 seats - priests who can clam down people in a religious way.
3 seats - accountants who can record the quantity of food.
7 seats - ordinary people or the ones who have special needs