Question

Which one is the age of fish?
A. Devonian
B. Silurian
C. Permian
D. Cretaceous

Answer 1

Hint: The time scale which depicts the chronological order with which the Earth is aging is known as the geological time scale. Through this measurement, the pattern of evolution of various species can be traced as well as the changes in the Earth’s atmosphere.

Complete answer:
The geologic period known as the age of fish is known as the Devonian period, which belongs to the paleozoic era. It existed about 360 million years ago. This period showed the emergence of Amphibians but was dominated by fishes. A substantial diversity among fishes was observed during this period.
Considering the other given options:
-Silurian period is the shortest in the paleozoic era. The diversification of jawed and bony fishes occurred during this period. Multicellular life occurred on land for the first time in this period. It occurred right before the devonian period. Thus it is not the right option.
-Permian is the final period in the paleozoic era, and it witnessed a mass extinction of insects. A diversification of amniotes into various classes such as amphibians, mammals, and further groups occurred.
-Cretaceous is the last period that occurred in the mesozoic era. It was the final period that was known as the age of dinosaurs. And the end of this period also witnessed the mass extinction of dinosaurs.
Thus, the most appropriate option among the given is A, that is, devonian period is also known as the age of fishes.

Note: The paleozoic era is also known as the era of early or ancient life. It consists of six periods, namely, Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian periods in the order of their occurrences.