Question

What is the correct arrangement of periods of the Paleozoic era in ascending order in the geological time scale?
A. Cambrian → Devonian → Ordovician → Silurian → Carboniferous → Permian.
B. Cambrian → Ordovician → Silurian → Devonian → Carboniferous → Permian.
C. Cambrian → Ordovician→ Devonian → Silurian → Carboniferous → Permian.
D. Silurian →Devonian→ Cambrian → Ordovician →Permian→ Carboniferous.

Answer 1

The Paleozoic Era, is the era of geological time that starts in about 520 million years ago and ran to 250 million years ago, it was in this era many great changes happened on this planet Earth. The era embarks the formation of a new supercontinent. Cambrian and Permian were first and the last period in this era respectively.

Complete answer:
The Paleozoic Era is divided into the Cambrian, Ordovician, Silurian, Devonian, and Carboniferous and Permian era periods, each with characteristic groups of fossils.

The Paleozoic era is also known as the era of ancient life on the planet earth. It is categorized into six different periods as Cambrian, Ordovician, Silurian, Devonian, and Carboniferous and Permian period. The Cambrian period existed about 520 to 505 million yrs ago and in that period invertebrate phyla and some invertebrate animals dominate. The Ordovician period starts from 505 to 430 million years ago and the first vertebrates were found in this era. The Silurian period existed 430-410 million years past in time characterized by the origin of jawed marine animals, wingless arthropods and some terrestrial plants. The Devonian period starts and from 410 to 360 million years ago where the appearance of amphibians and fishes became the dominant species on earth. Carboniferous period was from 360 to 285 million years past in time and is characterized by the appearance of first reptiles, fern and some seed bearing plants. Permian period is the last one which existed from 285 to 250 million years ago, where primitive reptiles and conifers were observed.

The Paleozoic era is categorized into six periods of time. Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian are the six divisions of the Paleozoic era accordingly.

Hence, the correct answer is option (B).

Note:
Cambrian - 520 million to 505 million years ago.
Ordovician- 505 million to 430 million years ago.
Silurian- 430 million to 410 million years ago.
Devonian- 410 million to 360 million years ago.
Carboniferous- 360 million to 285 million years ago.
Permian- 385 million to 250 million years ago.