What is the color and the kind of protist is navicula is it animal or plant protist ?

Question

is it unicelluar or multicelluar

Answer 1

Look at these pix of Navicula: http://www.altavista.com/image/results?itag=ody&q=navicula&kgs=1&kls=0

You can see that it is a unicellular protist -- in fact it's a diatom. Diatoms are algae (plant-like) and are termed golden algae.