2025年1月5日 · animal, (kingdom Animalia), any of a group of multicellular eukaryotic organisms (i.e., as distinct from bacteria, their deoxyribonucleic acid, or DNA, is contained in a membrane …

animal, Any member of the kingdom Animalia (see taxonomy), a group of many-celled organisms that differ from members of the two other many-celled kingdoms, the plants and the fungi (see …

2025年1月5日 · Animal - Multicellular, Heterotrophic, Eukaryotes: A characteristic of members of the animal kingdom is the presence of muscles and the mobility they afford. The muscles that …

All members of the animal kingdom (Animalia) are multicellular—that is, all have bodies composed of many cells. Multicellular animals are sometimes referred to as metazoans, to …

2025年1月5日 · Animal - Classification, Taxonomy, Phylogeny: Because the aschelminths have not been studied adequately by modern methods, there is no consensus on their classification. …

In Linneaus’s time, scientists characterized organisms as either plants or animals. Linnaeus followed this general rule, dividing all living things into two kingdoms—the Kingdom Plantae …

The eukaryotic kingdoms now include the Plantae, Animalia, Protista, and Fungi, or Mycota. The protists are predominantly unicellular, microscopic, nonvascular organisms that do not …

2025年1月5日 · Animals evolved in the seas but moved into fresh water and onto land in the Ordovician Period, after plants became available as a food source.A simple history of animal …

vertebrate, any animal of the subphylum Vertebrata, the predominant subphylum of the phylum Chordata.They have backbones, from which they derive their name. The vertebrates are also …

In the 1960s, American biologist Robert Whittaker proposed a classification system based on five kingdoms: Monera (prokaryotes), Protista (chiefly protozoa and algae), Fungi (molds, yeasts, …