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Q.

Which one of the following animals has the largest brain in proportion to its body size?

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a

Birds

b

Dolphin

c

Cockroach

d

Elephant

answer is D.

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Detailed Solution

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Dolphin is a cetacean mammal. Its brain is the largest in proportion to its body size. 

All cetaceans have the highest brain-to-body weight ratio, but dolphins have the highest among the rest. Bottlenose dolphins have larger brains than humans, with a brain-to-body-weight ratio that is higher than that of great apes.

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Which one of the following animals has the largest brain in proportion to its body size?