Male-female structural differences in the brain are referred to as

What are two reasons for why a species might disappear from the fossil record?

What would happen if the krill were removed from the food web

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