The sexual partners a person has, the greater the chance that person will be exposed to HIV/STD's. -more
-less

What is the farthest destination to date for a human spaceflight mission?

What substance acts to prevent sudden ph changes in bodily fluids?

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