GK
GENERAL SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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People at the beach notice a large fin sticking up out of the water and are trying to determine if it belongs to a shark or a dolphin. The tail suddenly becomes visible, and they figure out that it is flattened top-to-bottom. Is this a shark or a dolphin?
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shark
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dolphin
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -Another example of analogous structures are dolphins and sharks as whole species.
Detailed explanation-2: -The dorsal fin is in fact a highly effective balancing mechanism-a keel in reverse, if you like. The fact that most sharks are encountered by human swimmers at the surface doubtless has more to do with the habits of humans than of sharks.
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