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Golden age of reptiles was
(a)Proterozoic era
(b)Palaeozoic era
(c)Mesozoic era
(d)Cenozoic era

Answer
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Hint It is one of three geologic eras of the Phanerozoic Eon, preceded by the Paleozoic ("ancient life") and succeeded by the Cenozoic ("new life"). The time is partitioned into three significant periods: the Triassic, Jurassic, and Cretaceous, which are additionally partitioned into various ages and stages.

Complete answer
The Mesozoic era is known as the golden age of reptiles as reptiles became dominant during this period. The time frame, which ranges from around 252 million years prior to around 66 million years back.

Additional information
The time started in the wake of the Permian–Triassic annihilation occasion, the biggest all-around reported mass elimination in Earth's set of experiences, and finished with the Cretaceous–Paleogene eradication occasion, another mass termination whose casualties incorporated the non-avian dinosaurs. The Mesozoic was a period of critical structural, atmosphere, and developmental movement. The period saw the steady breaking of the supercontinent Pangaea into discrete landmasses that would move into their present situations during the following time. The atmosphere of the Mesozoic was shifted, switching back and forth among warming and cooling periods. Generally speaking, in any case, the Earth was more blazing than it is today. Dinosaurs previously showed up in the Mid-Triassic, and turned into the predominant earthbound vertebrates in the Late Triassic or Early Jurassic, possessing this situation for around 150 or 135 million years until their end toward the finish of the Cretaceous.

So the correct answer is ‘Mesozoic era’.

Note: Birds first appeared in the Jurassic (however, true toothless birds appeared first in the Cretaceous), having evolved from a branch of theropod dinosaurs. The primary warm-blooded animals additionally showed up during the Mesozoic however would stay little—under 15 kg (33 lb)— until the Cenozoic. The blooming plants (angiosperms) showed up in the Early Cretaceous and would quickly broaden all through the period, supplanting conifers and different gymnosperms as the predominant gathering of plants.