ArcticEngineer

I understand that is section is for help only but I don’t know how to approach this without asking for the answer straight up

Basically I’m doing a fill in the blank with a single clue and one letter filled out for my life science class. I’ve been stuck on 2 problems and couldn’t find help in the text book and decided to come here

here is the stuff

”Parts working together for one purpose”

_ _ _ _ _ m

”A self contained smaller unit”

_ _ b _ _ _ _ _ _

thsnks for any help!