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Question

Following characteristics are exhibited by certain organisms-
a) Open circulatory system
b) Kidney like organ for excretion
c) Foot for locomotion

Identify which among the following organisms are likely to exhibit these characters.

A
Round worm and flat worm
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B
Snails and mussels
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C
Centipede and Scorpion
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D
Sea horse and dog fish
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Solution

The correct option is B Snails and mussels
All the mentioned characteristics belong to phylum Mollusca. The organisms belonging to this phyla are usually bilaterally symmetrical. They have an open circulatory system. Here the blood flows in open spaces. They have kidney like organs for excretion. The body of molluscs is unsegmented with a distinct head, muscular foot and a visceral hump. Foot is used for locomotion.

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