What is the primary function of a chloroplast?

The darkly pigmented area of the human breast is known as the:

In 1957, Roger Revelle and his colleague Hans Seuss were concerned that most of the excess carbon dioxide produced by fossil fuel combustion would be absorbed by the oceans but quickly exchanged back to the atmosphere leading to global warming. They were not the first to predict the trouble ahead. What Swedish chemist predicted an atmospheric hothouse from the same scenario (though he thought it would take centuries to occur) in 1896? 

Two major components of the extracellular matrix of bone is collagen and hydroxyapatite. The rock hard part of bone is the mineral hydroxyapatite. What are the principal ingredients of hydroxyapatite? Mark all that apply.

Genetic diversity is a function of a population’s “age.” What factors determine a population’s age. Mark all that apply.

Tap water has a neutral pH. Unpolluted rainwater has a pH of 5.6? What chemical reaction in the atmosphere is making rainwater acidic?

What happens to the pH of the oceans when more carbon dioxide enters the atmosphere?

Most of the oxygen in our atmosphere comes from:

What happens to the blood sugar of a person with lactase persistence after drinking a quart of milk?

Charles David Keeling received job offers from both the U.S. Weather Bureau in Washington, D.C. and Scripps Institute of Oceanography in San Diego, California. Which offer did he take?