Exam 22: Evolution and the Origins of Life

Match each stage in the evolution of humans to its description. -first in the human line to use tools; had a diet that included meat instead of a vegetarian diet

Darwin's proposal that organisms that are better suited to their environment are more likely to survive and reproduce is termed ________.

The evolution of eukaryotic cells began approximately ________ years ago.

Movement of individuals into or out of population that results in a redistribution of alleles is called ________.

With the advent of photosynthesis and the subsequent production of oxygen by photosynthetic organisms, most of the anaerobic organisms present on Earth became extinct because oxygen was actually toxic to these organisms.

The best-known extinction during which all dinosaurs died out completely occurred during the ________ time period.

In the 1940s, the population of whooping cranes in North America neared extinction, with fewer than 30 birds surviving. The population has since expanded to several hundred birds today. It is likely that these several hundred birds will exhibit very little genetic diversity. This is an example of

When considering evolution, structures of present-day organisms that have the same function but did not develop from the same ancestral structure are said to be ________.

Match each stage in the evolution of humans to its description. -decline in sexual dimorphism; formation of hunting and gathering groups that shared food; first in the human line to move from Africa to Europe and Asia