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The answer is (a) By the entire body surface.
1 5 1
Its obvious that the unicellular organisms can't have teeth.

Some unicellular organisms like Amoeba use their body surface for ingestion.

However, Some unicellular organisms like Paramoecium have a so-called Mouth for ingestion.
1 5 1
I have given you all the possible alternatives
And that's the truth for this contradictory question
However, you may go with option (a) body surface
Nice ans..
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