What is the structural framework in a cell?

Which of these is not a function of some membrane proteins ? a.allowing polar molecules to enter the cell b.recognizing other types of cells c.receiving messeges from other cells b.carrying messages to oher cells

Iwill give brainiest to first person who gets it ! what are 3 basic types of interactions we see in an ecosystem?

Hey me with this one❤☺❤ how do you say that a cell also has a life span and death like an organism? give one example.