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Question :
Which one of the following animals has a three-chambered heart?
Answer : B
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Question :
Animals which are marine, bilaterally symmetrical, have a coelom and a notochord,but never form a vertebral column are placed under which one of the following groups ?
Answer : A
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Question :
Which one of the following is an example of vestigial organ in man?
Answer : B
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Question :
Which one of the following is a free-living bacterium that helps in nitrogen fixation in soil?
Answer : A
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