Eras, like the Paleozoic, Mesozoic, and Cenozoic periods are separated into periods by which marker?

Question 4 options:

Changes in rock layers

Species extinction

100 million year chunks

The types of living organisms that were present

What does the term 'economy' mean to you?

What percentage of North America is covered by forests? A. 12% B. 25% C. 36% D. 48%

What potential dangers do you see with creating polders that are below sea level

What do you think of when you hear the word "weather"? Try to be humorous, informational, add some humor, but add some facts at the same time (For an essay)

What is the distance of the sun from Earth?

How have increased carbon dioxide levels and temp affected living organisms

what waterway forms a natural border between isreal and Jordan? which salt water lake does it flow? what desert is located in southern isreal.

Find the area of the shape shown below. 12 by 4 by 4

What is the largest country in the Caribbean? What is its capital?

What effect did the dissolution of the Soviet Union have on global community? Select all that apply. affected Russia and the former Soviet republics only altered political alliances changed European borders decreased European conflict expanded the