Which is the average of the mass number of an elements isotopes

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

Which conditions need to be in balance for cells to function? check all that apply. blood sugar food intake body water body temperature body mass

An example of a trait that would be considered acquired and inherited is a. a cleft chin b. muscle tone c. scar tissue d. freckled skin