Age of Humans Review

What was probably the first organism on Earth?

• Plants
• Alligators
• Bacteria
• Fish

The ______________ era covers almost 90% of earth's history.

• Paleozoic 
• Mesozoic 
• Cenozoic
• Precambrian 

Which is the most recent era of time- the one that we are currently in?

• Mesozoic 
• Paleozoic 
• Cenozoic 
• Precambrian 

The end of an era is typically marked by what?

• mass extinctions
• meteor impacts
• humans hunting
• cold weather

The principle that states that the processes occurring since Earth formed is known as the principle of

• uniformitariansim

• original horizontality

• superposition

• cross-cutting relationships

What is the longest unit of time?

• Eon

• Era

• Period

• Epoch

Which Era was dominated by dinosaurs?

• Paleozoic

• Mesozoic

• Cenozoic

• Cambrian

Which segment of time is the smallest?

• Eon

• Era

• Period

• Epoch

Which era began with the early invertebrates, such as trilobites and brachiopods.

• Paleozoic

• Mesozoic

• Cenozoic

Trilobites are extinct animals that lived in the oceans. Fossils of these animals can be found in dry areas such as Cincinnati. What does this indicate?

• Trilobites now live underground.

• Trilobites are the ancestors of jellyfish.

• Cincinnati was once covered by the ocean where trilobites lived.

• The environment changed, creating small saltwater lakes in Cincinnati.