Given the question: Information: - Plants are mainly multicellular, predominantly photosynthetic eukaryotes of the kingdom Plantae. - Mastigamoeba is an amoeboid genus. The exact classification is subject to debate, including the assumption that it is synonymous with Phreatamoeba. - Protist is an informal term for any eukaryotic organism that is not an animal, plant or fungus. The protists do not form a natural group, or clade, but are often grouped together for convenience, like algae or invertebrates. In some systems of biological classification, such as the popular 5-kingdom scheme proposed by Robert Whittaker in 1969, the protists make up a kingdom called Protista, composed of "organisms which are unicellular or unicellular-colonial and which form no tissues." - Breviata anathema is a single - celled protist . It lacks mitochondria but has numerous differences with other amitochondiate Amoebozoa like Entamoeba and Endolimax . Because B. anathema has genes which are known from mitochondria , it is likely to possess degenerate mitrochondria . The closest relatives of B. anathema are not clear ; molecular data places it in the Amoebozoa , but without obvious affinity to known groups of Amoebozoa . It has previously been studied under the name Mastigamoeba invertens . - Algae (singular "alga" ) is an informal term for a large, diverse group of photosynthetic organisms which are not necessarily closely related, and is thus polyphyletic. Included organisms range from unicellular genera, such as "Chlorella" and the diatoms, to multicellular forms, such as the giant kelp, a large brown alga which may grow up to 50m in length. Most are aquatic and autotrophic and lack many of the distinct cell and tissue types, such as stomata, xylem, and phloem, which are found in land plants. The largest and most complex marine algae are called seaweeds, while the most complex freshwater forms are the Charophyta, a division of green algae which includes, for example, "Spirogyra" and the stoneworts. - A clade (from , "klados", "branch") is a group of organisms that consists of a common ancestor and all its lineal descendants, and represents a single "branch" on the "tree of life". - A fungus (plural: fungi or funguses) is any member of the group of eukaryotic organisms that includes unicellular microorganisms such as yeasts and molds, as well as multicellular fungi that produce familiar fruiting forms such as mushrooms and bracket fungi. These organisms are classified as a kingdom, Fungi, which is separate from the other eukaryotic life kingdoms of plants and animals. - Animals are multicellular, eukaryotic organisms of the kingdom Animalia (also called Metazoa). The animal kingdom emerged as a basal clade within Apoikozoa as a sister of the choanoflagellates. Sponges are the most basal clade of animals. Animals are motile, meaning they can move spontaneously and independently at some point in their lives. Their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later in their lives. All animals are heterotrophs: they must ingest other organisms or their products for sustenance. Given the information above, choose from the list below the object entity that exhibits the relation 'taxon rank' with the subject 'breviata'. Choices: - branch - form - genus - group - kingdom
The answer is:
genus