Prokaryotes

Figure 2.3 The six kingdoms, according to one taxonomic approach.

complex cell type that is characterized by internal membrane structures and membrane-based organelles. Eukaryotic cells are much larger than prokaryotes; animal cells are typically about 20 mm across, and plant cells are about 35 mm.

The next level of classification below kingdom is phylum (in animals) or division (in plants and fungi). Figure 2.3 summarizes the variety of life at the domain and kingdom level and shows some of the major phyla and divisions. Table 2.1 shows how several

TABLE 2.1 Classification of Several Familiar Eukaryotes

Kingdom

Animalia

Animalia

Animalia

Kingdom

Plantae

Phylum

Chordata

Chordata

Arthropoda

Division

Anthophyta

Subphylum

Vertebrata

Vertebrata

Uniramia

Subdivision

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