Question

What event characterized the Paleozoic era?

Answer 1

The event that characterizes the Paleozoic era is the Cambrian explosion, according to which a large number of biological class prevalent today are primitive of fish and corals that evolved during that era.

Further Explanation:

The Paleozoic Era is run from nearly five hundred forty-two million years ago to two hundred fifty-one million years ago; that was the time many changes occur on earth. This era starts with the breakdown of the supercontinent and the formation of a new one. In this era, many plants are developed and also very first animal (vertebrate) found on land. This era is divided into six different periods, namely:

• Cambrian
• Ordovician
• Silurian
• Devonian
• Carboniferous
• Permian

After this, many Paleozoic seas found with blastoid and crinoid echinoderms, rugose corals, tabulate, graptolites, and articulate brachiopods. At the last phase of this era, glossopterids, cycads, ferns, and primitive conifers were present across many landscapes. The Paleozoic mass disappears at the late phase of Devonian and end phase of Ordovician. The end phase of this era is referred to as the Permian period.

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Answer Details:

Grade: High School

Subject: Biology

Chapter: Evolution

Keywords:

Permian, Devonian, Ordovician, mass, Paleozoic era, blastoid, landscapes, sea, end phase, echinoderms, rugose.

Answer 2

The  phanerozoic geologic era is divided into three and the paleozoic era is the first among them. The paleozoic era occurred about 902 million years ago and it divided into six different periods. It was a time of dramatic changes in term of climate, geology and evolution.  
During the first period of the paleozoic era large number of creatures evolved, this is called Cambrian explosion. Most of the biological classes that are still prevalent today such as primitive fish and coral were evolved during this era. Mass evolution of fish also occured during this era. <span />