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(A) $Opalina$ is a genus of parasitic protozoans found in the intestines of amphibians. Although they are multinucleated,they are considered structura

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Opalina

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(A) $Opalina$ is a genus of parasitic protozoans found in the intestines of amphibians. Although they are multinucleated,they are considered structurally and functionally unicellular because they lack cellular differentiation into tissues or organs and do not have cell boundaries between nuclei within the single cell body. In contrast,$Hyalonema$ and $Leucosolenia$ are multicellular sponges (Porifera),and $Vaucheria$ is a coenocytic alga (multinucleated but not considered unicellular in the same sense as $Opalina$ due to its complex filamentous structure).

Column-$I$ (Type of Protozoans)	Column-$II$ (Examples)
$A$. Amoeboid protozoans	$I$. Paramecium
$B$. Ciliated protozoans	$II$. Plasmodium
$C$. Flagellated protozoa	$III$. Amoeba
$D$. Sporozoans	$IV$. Trypanosoma

Which organism is structurally and functionally unicellular?

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