Who built the union pacific track of the transcontinental railroad?

leland stanford

thomas durant

cornelius vanderbilt

john d. rockefeller

In which research method does a researcher change the value of one variable to determine how the change affects another variable? a. experiment b. observational research c. survey d. case study

How does cloud cover affect how much infrared light is reflected back to the ground?

Which religions are most commonly practiced in south asia