Who postulated the theory of inheritance of natural selection? 

Birds are believed to have evolved from ________.

An iridium-rich layer of clay, glass spherules, and shocked quartz grains strongly suggests that the K-T boundary extinctions were at least in part caused by ________.

Which of the following is a Cenozoic erosional feature of the Colorado Plateau (in North Arizona)?

Increased CO2 in the atmosphere results in ________

Which of the following were the first humans to move out of Africa?

What is the name for the “thumbs up” dinosaur (thumb was originally on his nose)?

The Homo sapiens subspecies with heavy brow ridges and prognathous chinless jaws that flourished during the Ice Age is called ________.

Questions 13–15 relate to the geologic cross section below. Note that the legend lists rock types in alphabetical, rather than stratigraphic, order. 

South America split from Africa during ________.