Why did Charles David Keeling start sampling atmospheric carbon dioxide at Cal Tech?

Henry Wexler of the US Weather Bureau and Roger Revelle of Scripps Institute of Oceanography both wanted Charles David Keeling to launch a program that would continuously measure __________ at remote weather stations around the world (e.g. Mauna Loa (Hawaii) and Little America (Antarctica). 

When did movie theaters begin selling popcorn in the United States?

What mammal is the only one that can digest milk as an adult?

Which variety of corn is the most widely grown in the United States?

The cycling of carbon between the atmosphere and living organisms relies on producers ______ and consumers _____.

What is the primary function of a chloroplast?

The five independent mutations that result in lactase persistence are base substitutions located within: 

What evidence convinced George Beadle that corn was descended from teosinte? Mark all that apply.

What variety of corn is used to make corn meal, grits, polenta, taco shells. tortillas, tortilla chips, Bourbon whiskey, corn starch, corn syrup, high-fructose corn syrup. plastics, and ethanol?