Find out the odd one:

  • A
    Unio
  • B
    Star fish
  • C
    Balanoglossus
  • D
    Rohu

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Match the following columns:
Column-$I$Column-$II$
$A$. Physalia$1$. Liver fluke
$B$. Taenia$2$. Sycon
$C$. Fasciola$3$. Tapeworm
$D$. Scypha$4$. Portuguese man-of-war

Select the correct matching sequence:

$A$ blastula which is solid,is known as

Trochophore larva is found in

Which of the following phyla possess an open circulatory system?

The given figure shows four animals $A, B, C$ and $D$. Select the correct option regarding the common features shared by any two of them.

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