Animals that have gills when found and lungs as adults?

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

Is dna the same in every cell in the human body explain your answer

As water is cooled from 4 to 0, its density