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Question

Find odd one with respect to circulatory system?
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Solution

The first organism depicts a human (you). The second figure is that of a mollusk (squid), the third is of an annelid (leech and the last is of another annelid ($${ Nereis }$$).
The circulatory system in humans is the closed type. In squid, as in belongs to the evolved class Cephalopoda, it has a closed circulatory system. $${ Nereis }$$ is an annelid and has a closed circulatory system. But leeches have an open circulatory system despite being annelids.
So the odd one out is Leech (figure 3).

Biology

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