Vitamin a is essential for what?
a. metabolism of carbohydrates.
b. a healthy immune system.
c. eyesight.
d. none of the above.

Which countries were controlled by france at the beginning of world war i? hint: use the map in the lesson to you answer this question. algeria burma cambodia indonesia vietnam

All of the following occurred due to the invention of the railroad except

In plate tectonics, why is the north american plate tectonically inactive?