What is nuclear energy ⚡:}

An atom of nitrogen had seven protons in its nucleus. how many electrons does it have

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

Which statement describes the punctuated equilibrium theory?