Suppose you accidentally find an old preserved permanent slide without a label. In your effort to identify it, you place the slide under microscope and observe the following features
1.  Unicellular

2.  Well defined nucleus

3.  Biflagellate-one flagellum lying longitudinally and the other transversely
What would you identify it as? Can you name the kingdom it belongs to?

 All unicellular eukaryotic organisms form a link between plants, and animals. There organisms possess a well defined nucleus with membrane bound organelles and reproduce either sexually or asexually.
The it presence of two flagella one placed longitudanally and other transversely in a furrow between wall plates makes this organisms to be placed under Kingdom-Protista.