You are given an unknown organism to identify. It is unicellular and heterotrophic. It is motile, using many short extensions of the cytoplasm. It has well-developed organelles and two nuclei, one large and one small. This organism is most likely to be a .

The correct answer is: Ciliate.

Explanation:

Ciliate can be defined as single-celled eukaryotic organism belonging to the Taxonomic Phylum Protozoa.They possess small but motile extensions of the cytoplasm called the Cilia. The Cilia help in their movement.They possess two nucleus.The larger nucleus, also called the vegetative nucleus, is polyploid in nature and helps the cell to regulate its metabolism and phenotype.The smaller nucleus, also called the generative nucleus, is diploid in nature, contains the genome and is responsible for transmitting information to the next generation.Other organelles in the cells are well developed.An essential organelle is the Contractile Vacuole which is capable of maintaining the osmotic pressure in the cell by ejecting excess water out of the cell.