how is the protozoa look like?

Protozoa are single-celled animals that come in many shapes and sizes. The most common shapes are round, oval, bell-shaped and slipper-shaped. Protozoa are clear. They become the color of the materials inside them, including the food they just ate.

圖片參考：http://www.pirx.com/droplet/gallery/paramecium/paramecium1.jpg


圖片參考：http://www.sacsplash.org/cimages/protozoan3.jpg