Paleozoic Era

Which of the following is NOT a period from the Paleozoic Era?

• Cambrian Period

• Triassic Period

• Ordovician Period

• Permian Period

Which organism below would have had the earliest appearance?

• amphibians

• jawless fishes

• tribolites

• bony fishes

One possible cause of the mass extinction at the end of the Paleozoic Era is an asteroid hit the Earth.

• True
• False

Which of these happened during the Cambrian Period?

• The Age of Fishes

• Reptiles develop

• Organisms with shells and skeletons begin to appear

• A large explosion

What is an example of an invertebrate?

• Sabertooth Tiger

• Mammoth

• Reptile

• Jellyfish

What is an example of a vertebrate?

• Brachiopod

• Trilobite

• Reptile

• Jellyfish

What occurred during the Ordovician Period? (check your notes)

What occurred during the Devonian Period?

• Ferns develop

• Age of Fishes (sharks appear!)

• Animals begin to appear on land

• All of the given choices occurred during the Devonian Period.

What occurred during the Silurian Period?

• Organisms with shells and skeletons begin to appear

• Vertebrates appear

• First insects evolved

• Coal forests develop

Which period marked the end of the Paleozoic Era?

• Carboniferous Period

• Devonian Period

• Cambrian Period

• Permian Period