Some zebras watch for predators while others eat.
This is an example of...
a) migration
b) social interaction
c) hibernation
d) mimicry

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