What is the closest living relative of a chloroplast?

Teosinte grows wild throughout Mexico. Where in Mexico does the closest living form of teosinte and ancestor of modern occur?

In 1965, Roger Revelle and Charles David Keeling served on a presidential science committee and predicted the impact of fossil fuel combustion on climate. Their report was published and communicated to public officials. How accurate was their predicted carbon dioxide level in the year 2000?

What variety of corn stores poorly and must be eaten fresh?

The Brahman breed is a hybrid of taurine and indicine:

What hormone stimulates the milk let-down reflex?

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). 

What variety is the preferred corn for making hominy, a staple food since pre-Columbian times?

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

Suckling signals the _______________ to inhibit a prolactin inhibitory cell, the anterior pituitary responds by secreting prolactin that stimulates lactogenesis in the mammary glands.