Biology · BIOLOGICAL CLASSIFICATION

*Paramoecium* and *Amoeba* were earlier classified under the animal kingdom because they lack cell walls. Why were they reclassified into Kingdom Protista alongside *Chlamydomonas* and *Chlorella*?

1. A
   Because all four possess autotrophic photosynthetic nutrition.
2. B
   Because all four are prokaryotic single-celled organisms.
3. C
   Because Kingdom Protista brought together all unicellular eukaryotic organisms.
4. D
   Because all four reproduce exclusively via sexual conjugation.