Your teeth
You’re welcome :)
The right answer is the second one
The very function, or job of CELL MEMBRANES is to protect the cell from it's surroundings, or in other words, to keep it safe. It controls the movement of substances in and out of cells and organelles, like a guard watching for suspicious activity and protecting something.
The cell membrane itself is a thin, flexible layer around the cells of all living things. It separates the inside of the cells from the outside of the cells.
Count the ones expressing the trait in the F2 gen. Divide by how many animals there are in F2. Times by 100.