History of Life on Earth

Front

What is the method used to determine the approximate age of bones using layers of rock?

Back

Relative dating using index fossils.

Front

What era is commonly known as the Age of Reptiles?

Back

Mesozoic era.

Front

What are organisms called that have cells with a nucleus and complex structures?

Back

Eukaryotes.

Front

What is the standard method used to divide Earth’s history into manageable parts?

Back

Geological time scale.

Front

What term describes the event when every individual of a species has died?

Back

Extinction.

Front

What is the time period before the Paleozoic era called?

Back

Precambrian time.

Front

What type of organisms are simpler and do not have a nucleus?

Back

Prokaryotes.

Front

What is the longest division of geological time?

Back

Eons.

Front

What is the process called when species change over time?

Back

Evolution.

Front

What is the term for a fossil that is used to date other fossils?

Back

Index fossil.