What is Walter trying to say when he refers to African Americans as "the world's most backward race of people"? Does he seriously believe this?

The critical period for development, when exposure to disease prenatally can have the most devastating effects of growth, is

After you have discovered your career path it is important that your

Each autumn the forest floor is covered by leaves that have fallen from trees which type of organisms is most effective in decomposing the leaf tissue allowing the nutrients and minerals to be recycled in the environment?