10: Diversity of Eukaryotes- Protists, Fungi, Plants and Animals
- Page ID
- 117854
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- 10.4: The Animal Kingdom (Kingdom Animalia)
- Animals constitute a diverse kingdom of organisms. Although animals range in complexity from simple sea sponges to human beings, most members share certain features. Animals are eukaryotic, multicellular, heterotrophic organisms that ingest their food and usually develop into motile creatures with a fixed body plan. Most members of the animal kingdom have differentiated tissues of four main classes—nervous, muscular, connective, and epithelial—that are specialized to perform different functions.
Thumbnail: Elephant. (CC BY 2.0/cropped from original; Caitlin via Flickr).