(A) The organisms belonging to the group $Protozoa$ are unicellular eukaryotes. They perform all vital life functions such as respiration,excretion,an

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(A) The organisms belonging to the group $Protozoa$ are unicellular eukaryotes. They perform all vital life functions such as respiration,excretion,and reproduction within a single cell. In contrast,$Porifera$,$Coelenterata$,and $Platyhelminthes$ are multicellular organisms with varying levels of body organization.