An argument in favor of the wealth gap.

a. the lower classes have the opportunity to invest.

b. poor people can easily move into the middle class.

c. investments by the upper class create lower-class jobs.

d. buying power sharply increases for the working class.

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