Question

Are amoebozoans unicellular?

Answer 1

Hint: Amoebozoa is a major taxonomic group of approximately 2,400 species described as amoeboid protists, often with blunt, finger-like, lobose pseudopodia and tubular mitochondrial crystals.

Complete answer:
In most classification schemes, Amoebozoa is classified as a phylum within either the Protista kingdom or the Protozoan kingdom. In the classification favored by the International Society of Protistologists, it remains an unclassified "supergroup" within the Eukaryota. Amoebozoa is supported as a monophyletic clade by molecular genetic analysis.

Amoebozoa includes many of the best known amoeboid organisms, such as Chaos, Entamoeba, Pelomyxa and the Amoeba gene itself. Amoebozoa species may be either shelled (testat) or bare, and the cells may have flagella. Free-living species are common both in salt and freshwater as well as in soil, moss and leaf litter. Some of them live as parasites or symbiotes of other organisms, and some of them are known to cause disease in humans and other organisms.

While the majority of amoebozoa species are unicellular, the group also includes several clades of slender molds which have a macroscopic, multicellular stage of life during which individual amoeboid cells remain together after multiple cell divisions to form a macroscopic plasmodium or, in cellular slender molds, one aggregate.

Thus, amoebozoans are unicellular.

Note: The size of Amoebozoa varies greatly. Some are only 10–20 μm in diameter, while others are among the largest protozoans. The well-known species Amoeba proteus, which can reach 800 μm in length, is often studied in schools and laboratories as a representative cell or model organism, partly due to its convenient size. Multinucleate amoebae, such as Chaos and Pelomyxa, may be several millimeters in length, and some multicellular amoebozoa, such as the "dog vomit" slime mold Fuligo septica, may be several square meters in length.