Earth is incredibly had a long history. Approximately, how old is the Earth?

• 4.5 million

• 45 million

• 4.5 billion

• 45 billion

Which organism first dominated the Earth?

• Dinosaurs

• Fishes

• Plants

• Bacteria

The largest division on the geologic time scale is called __________.

• Eon

• Era

• Epoch

• Period

The Mesozoic era is called the Age of reptiles, how about the Cenozoic era?

• Age of mammals

• Age of birds

• Age of humans

• Age of Technology

What is the longest part of Earth’s history where trace fossils appeared?

• Precambrian

• Paleozoic

• Mesozoic

• Cenozoic

The geologic time scale is subdivided into four groups. What is the correct sequence if you will arrange them from the largest to the smallest?

• Eon, period, epoch, era

• . Eon, era, epoch, period

• Eon, era, period, epoch

• Era, eon, period, epoch

Relative to the percent of time dominating the Earth, which organisms have the longest reign?

• Dinosaurs

• Plants

• Prokaryotes

• Humans

Which era were the first land plants formed?

• . Precambrian

• Paleozoic

• Mesozoic

• Cenozoic

Which event occurred during the Mesozoic era?

• Pangea formed

• Asteroid killed the dinosaurs

• Rocky mountain formed

• Pleistocene ice age began

Understanding geologic time scale is significant because it helps us to _______

• Understand human impact on our environment

• Understand the evolution of organisms over time

• Understand the evolution of organisms over time

• All of them