Ciliates, a single cell of ciliate is much more complex than any one cell in our body. Thus correct answer (a) .
The alveolates known as ciliates are distinguished by the presence of cilia, which are hair-like organelles that are structurally identical to eukaryotic flagella but that are typically shorter, more numerous, and have a distinct undulating pattern.
All members of the group contain cilia, which are utilized for a variety of activities including swimming, crawling, attachment, feeding, and feeling (although the unique Suctoria only have them for a portion of their life cycle).
Generally speaking, the environment contains free-living ciliates. There aren't many ciliates in the environment that are parasitic. The only species that may cause illness in humans is this one.
Aquaculturists may be concerned about some parasitic ciliates that are prevalent in fish and cause illness in fish. The parasites and commensals that live on invertebrates do not harm their hosts or the environment. So far as we know, ciliates are not dangerous.
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