Booker T. Washington, an educational leader, worked throughout the lifetime to improve economic conditions for Black people in the United States.
查看答案
The aging process is not entirely determined by heredity, but is influenced by different environmental and social circumstances as good.
Whichever they may differ widely in function, all cells have a surrounding membrane and an
Scientists finding out that the universe is even larger and more complex than anyone has ever imagined.
Best known for his research in statistical mechanics and meson physics, Chen Ning Yang shared the Nobel Prize in 1957 to another physicist from the United States, Tsung-dao Lee.