NEET BIOLOGY

Detailed explanation-1: -Paleozoic Era, also spelled Palaeozoic, major interval of geologic time that began 541 million years ago with the Cambrian explosion, an extraordinary diversification of marine animals, and ended about 252 million years ago with the end-Permian extinction, the greatest extinction event in Earth history.

Detailed explanation-2: -After the Cambrian explosion, many new types of complex multicellular organisms and most major groups of animals began to appear in the fossil record (Fig. 7.11). The time that followed the Cambrian explosion is divided into three geological eras: Paleozoic, Mesozoic, and Cenozoic. Fig.

Detailed explanation-3: -During the Paleozoic Era, which lasted 289 million years, plants and reptiles began moving from the sea to the land. The era has been divided into six periods: Permian, Carboniferous, Devonian, Silurian, Ordovician, and Cambrian.

Detailed explanation-4: -The Paleozoic Era is literally the era of “old life.” It lasted from 544 to 245 million years ago and is divided into six periods (see the Figure below). The era began with a spectacular burst of new life. This is called the Cambrian explosion. The era ended with the biggest mass extinction the world had ever seen.

Detailed explanation-5: -The Paleozoic era is divided into six periods. From oldest to youngest, these are the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian.