The Paleozoic era is the ــــــــــــــــــــ era in the Phanerozoic eon.

• oldest

• Youngest

• Smallest

• Shortest

which two period make up the middle Paleozoic?

• Cambrian and Permian

• Silurian and carboniferous

• Silurian and Devonian

• Cambrian and Ordovician

the Paleozoic era ended with ______ .

• The biggest party ever

• The largest mass extinction in Earths history

• a mass extinction

• Cambrian explosion

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-4

periods are subdivided into ـــــــــــــ .

• eons

• epochs

• eras

• hours

which of the following did not happen in late Paleozoic?

• amphibians disappeared

• amphibians evolved

• reptiles appeared

• coal swamps formed

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

in which period did coal swamps form?

• cambrian

• Silurian

• Devonian

• carboniferous

how many mass extinction occurred till now?

• 9

• 6

• 4

• 5

• none

Tags

NGSS.MS-LS4-1

what marked the end of the Precambrian period and the beginning of the Paleozoic era?

• A mass extinction

• A volcanic eruption

• The Cambrian explosion

• An Earthquake

The Paleozoic began how many years ago?

• 540 years ago

• 251 billion years ago

• 542 billion years ago

• 499 million year ago

• 542 million years ago

Tags

NGSS.MS-ESS1-4

The early Paleozoic was called the age of _______ .

• vertebrates

• invertebrates

• fishes

• reptiles

• amphibians