Two ramps of equal height are placed 1 m apart, and balls of equal mass are released from the top of each ramp. What happens to the motion of the balls when they meet in the middle? The balls will move in a random direction.

The balls will stop.

The balls will continue moving forward.​

The current thought on the structure of the cell membrane is: a. a static phosphate sandwich of lipids b. a fluid-mosaic of phospholipids and proteins c. a bilayer of proteins with static lipid molecules d. an impermeable bilayer of protein molecules e. a static and permeable phospholipid single layer