Which organism is most specialized?

a) bacteria

b) ant

c) cat

d) unicellular algae

The correct option is C, CAT.

Cat is an eukaryote and it possesses eukaryotic cells. The cells that are found in cat are specialized in that each type of cell perform only specific functions. The cells that are found in its digestive tract perform functions that are different from those found in its circulatory system.