What structure is also called the windpipe?

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

What sre the effects of hemolytic disease of a newborn

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