Help me please I need help I’ve been struggling

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

Monitor and apply fix up strategies

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