Protozoa are classified by the presence of cilia flagella and pseudopods or by their non motility. this classification method is based on their means of
1.growth
2.circulation
3.reproduction
4.locomotion

Protozoa are classified by the presence of cilia and flagella and pseudopods or by their non-motility. This classification method is based on their means of locomotion. These are flexible membrane extensions of the cells that vary in length and in structure. The major form of movement exhibited by many protozoans is through swimming (e.g. sperm cells). They propel themselves at great speeds through their environment either to transport food particles, expel particulate matter, or create new developing cells. 

It has an optimum pH of about 1.5. Trypsin's optimum pH is about 8.

Explanation:

This active trypsin acts with the other two principal digestive proteinases — pepsin and chymotrypsin — to break down dietary protein into peptides and amino acids. These amino acids are essential for muscle growth, hormone production and other important bodily functions.

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