Which of the following contributed most to the Great Depression? O A. A slow stock market O B. World War I O C. Falling crop prices O D. Low fuel prices

Which statements explains what the fossil records indicates? check all that apply. a) earth is 4.5 billion years old b) many organisms have become extinct c) mammals have always existed on earth d) mass extinctions have occurred several times on earth e) the amount of water on earth has decreased over time?