Question

As evidence from records which era had no life
A. Azoic
B. Proterozoic
C. Paleozoic
D. Cenozoic

Answer 1

Hint: The Azoic Era was the oldest and long-lasting stage in the development of earth. There was no evidence of life in this era. In this era, the ground has reddish colour and there was no evidence of oxygen either.

Complete answer:
The history of earth’s geological structure divided into five eras:
> Azoic era
> Paleozoic era
> Mesozoic era
> Cenozoic era
> Neozoic era
 The Azoic era is the era of the origin of the continental shelf. The continental shelf (Pangaea) was formed by the silica rich granite rocks of less density. Pangaea was formed in the azoic era and there is no evidence of the origin of organisms in this era.
The Paleozoic era began with the break of one supercontinent and the formation of another. Life developed in the seas.
The Mesozoic era is the era of middle life. It is also known as the age of dinosaurs. The Mesozoic era consists of the three periods:
The Triassic period
The Jurassic period
The Cretaceous period
The Cenozoic era began about 65 million years ago and continues into the present.
The Neozoic era is divided into two periods: Pleistocene and Holocene (modern age).

So the correct answer is option A.

Note: The word ‘Azoic’ is derived from the Greek word. The rock layer formed after the azoic era contains the remains of limy sea plants.