Question

Mesozoic era is called golden period of______________
A) Birds
B) Amphibians
C) Reptiles
D) Pisces.

Answer 1

The Mesozoic Era is a time from about 250 to 65 million years ago. This era includes three periods known as the Triassic, Jurassic, and Cretaceous periods. The name, Mesozoic era, is derived from the Greek word for “middle life”. The ancestors of a considerable groups of plant and animal that exist today first appeared during the Mesozoic era

Complete answer:
This era began after the Paleozoic era during which the greatest extinction of the earth took place. This extinction wiped out about 95% of all marine life and 70% of land-life. The new beginning allowed the dinosaurs to rule the land.So, the correct ‘Reptiles’.

The Mesozoic was a period of tectonics, climate, and evolutionary activities. The era saw the gradual rifting of the supercontinent Pangaea into separate land masses that would move into their current layouts during the next era. The climate was varied, alternating between warming and cooling periods. The Earth was hotter than it is today.

Dinosaurs first appeared in the mid-Triassic and became the dominant terrestrial vertebrates in the late Triassic or early Jurassic. Birds are believed to have evolved from a branch of theropod dinosaurs. However, true birds (toothless) appeared later, after this era. Ancestors of living vertebrates, like frogs, and salamanders, appeared on land accompanying the two important modern mammal groups, the placentals, and the marsupials. Even though this was a period of the beginning of the rise of many animals of different classes, it is noted as the golden period for reptiles.

The Triassic terrestrial environment was dominated by the therapsids, sometimes referred to as “mammal-like reptiles,” and the thecodonts, which are the ancestors of dinosaurs and crocodiles, both of which appeared during the Late Triassic. The first true mammals, which were small, and not so wee-developed, also appeared in the Late Triassic, and so did the lizards, turtles, and flying pterosaurs. Molluscs like ammonites, bivalves, and gastropods became a dominant group in the oceans. Fishes, sharks, and marine reptiles such as plesiosaurs, nothosaurs, and ichthyosaurs also swam during the Mesozoic era.

Thus the correct answer is option ‘C’i.e, reptiles.

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