Within kingdom protista, are subdivided into the flagellates, the amoebas, the apicomplexans, and the ciliates.

Within kingdom Protista, Protozoa  are subdivided into the flagellates, the amoebas, the apicomplexans, and the ciliates.

Explanation:

The protist is an organism of eukaryotic family but is neither plant and fungus nor animal. It contents are divided in various super groups, like- protozoa, algae, excavate etc. It was first coined by Ernst Haeckel in the year 1886.

The ‘protists’ were divided in various groups depending on the kingdom that is higher. The first group is of Protozoa, a single celled organism that looks like animal. This group is again classified in super groups of – flagella, amoeba, ciliophora etc.  

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.