Scientists believe that the polar bear in Alaska and the brown bear in Russia evolved from a common ancestor. Which would be responsible for this evolutionary change?

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

How energy flows through each level in this energy pyramid. is all the matter and energy from one level transferred to the next level?

Which is the most likely reason the writer of the play pygmalion chose to change the character of galatea from a statue to working-class woman?