What might be some characteristics that could have helped some species of forams survive the K-T mass extinction event.

Mitochondria produce atp, a high energy compound. atp is used for all sorts of enzyme-mediated reactions, such as making proteins/nucleotides/etc, certain compounds cross the cell membrane, muscles move, etc.  without this source of energy, a cell will die. it will not be able to repair itself, defend against pathogens, etc.

They use the si unit, or metric system its all the same thing

I'm soooo sorry but i can't answer but you can ask another professor