Most protist are unicellular (single-celled). Because they tend to be so small, you need to use a microscope to see them. A single cell can be as large as a tennis ball or so small that thousands would fit on the period at the end of this sentence. Regardless of its shape or size, every cell contains the things needed to maintain life. Protists are able to carry out all the life functions even though they are only one cell in size. Cells come in a variety of shapes and sizes. Protists are animal - like, plant-like or fungus-like. The animal-like protists called protozoa have either cilia (hairs), a flagellas (tails) or are pseudopods (false feet). Most protists live in water but can found anywhere.