Exam 22: Earths Evolution Through Geologic Time

Compare and contrast western and eastern North America during the Cenozoic Era.

In what kind of environment did the organism in this image live?

When did the Big Bang occur?

Evaluate the validity of the idea that Earth is "The Goldilocks Planet" in the solar system.Support your position with three points.

Which process is responsible for the oxygen in the atmosphere today?

Which of the following organisms is defined as a primitive, single-celled organism that lacks separation between the nucleus and the rest of the cell?

Most Precambrian rocks lack fossils, which makes correlating rock units over large distances difficult.

Pluto has been downgraded to the status of a protoplanet.

In what geologic period did lobe-finned fish adapt to terrestrial environments?

A(n)________ is defined as a cataclysmic, explosive death of a star.

Explain how interstellar debris will eventually form a planetesimal.

The early Earth was not hospitable to life as we know it because of meteorite bombardment, an oxygen-poor atmosphere, and the molten state of the planet for the first few million years.

Why is there virtually no hydrogen and helium present in the atmosphere today?

Oxygen was one of the main gases in the early atmosphere.

What role did the creation of the ozone layer have in the distribution of life forms across the planet and why?

Which of Earth's major extinctions was the most extensive, eliminating 70 percent of all terrestrial organisms and up to 95 percent of marine organisms?

What is the name of the theory that describes the formation of the universe?

Which organism, developing approximately 4.2 million years ago, represents the link between humans and apes?

Some of the dominant marine reptiles of the Mesozoic were reptiles whose ancestors had evolved on land, but returned to life in the sea.What physiological evidence supports this interpretation?

What is a craton?