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UPSC Previous Year Questions: CSP 2021

Hey! thank you so much. Do you also happen to have a similar compilation of other UPSC exams like CAPF, CDS etc? 

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From the point of view of evolution of living
organisms, which one of the following is the correct
sequence of evolution?
(a) Otter – Tortoise – Shark
(b) Shark – Tortoise – Otter
(c) Tortoise – Shark – Otter
(d) Shark – Otter – Trotoise
Can someone explain why its answer  is option b

Don't know. But a simple Fish - amphibian/reptile - mammal sequence can be used. But that's just a general rule. Could be wrong at cases. 

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