Although the atrocities against african americans were well known, why was so little done to prevent them?

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

Which of the following would most likely cause a large number of density independent deaths in a population

Which two organisms in the food web would most likely be affected by a decrease in producers, or the plants, at the bottom base of the food web?