What distinct characteristics of the HIV/AIDS pandemic enabled its global spread?

Facial shaving brushes are either bulb-shaped or fan-shaped. an experiment is to be conducted to determine whether the lather thickness is the same for both types of shaving brushes. in previous studies, it was determined that shaving brush size (small, medium, large) is associated with lather thickness, but shaving brush type (wolf whiskers, maggard razors, frank shaving, and so on) is not associated with lather thickness. how could the experiment best be conducted? by blocking on shaving brush size by blocking on shaving brush type by blocking on shaving brush shape by blocking on lather thickness without blocking

Ill give you free brainliest + free points if you answer this drvers ed question correctly! when merging, yield to traffic a. already on the road you're joining b. on your right side only c. if it's going slower than you d. if it's going the same speed as you

Explain the popular saying "we are made of stardust. how are we made of stardust? use scientific vocab.