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Animal Kingdom (Animalia) Animals are heterotrophs that must eat other organisms to survive.
Kingdom Animalia
The Kingdom Animalia comprises multicelluar organisms that digest their food.
-Kingdom Animalia is the kingdom that has organisms which are eukaryotic, multicellular, heterotrophic, can reproduce sexually or asexually, and have no cell wall. -General characteristics of the Kingdom Animalia includes; Animals are eukaryotic, multicellular and heterotrophic organisms.
In biology, a scheme of classifying organisms into six kingdoms: Proposed by Carl Woese et al: Animalia, Plantae, Fungi, Protista, Archaea/Archaeabacteria, and Bacteria/Eubacteria.
Animalia
Kingdom | Number of Cells | Examples |
---|---|---|
Prokaryotae | Unicellular | Bacteria, Cyanobacteria |
Protoctista | Mainly Unicellular | Amoeba |
Fungi | Multicellular | Mushroom, Mold, Puffball |
Plantae | Multicellular | Trees, Flowering Plants |
Woese found that the six kingdoms naturally cluster into three main categories, based on the sequence of 16s ribosomal RNA genes. He called these categories as domains of life. These domains are Bacteria, Archaea, and Eukarya. He also believed that these domains have originated from common ancestors called Progenote.
NNehring / Getty Images. The protista kingdom includes a very diverse group of organisms. Some have characteristics of animals (protozoa), while others resemble plants (algae) or fungi (slime molds). These eukaryotic organisms have a nucleus that is enclosed within a membrane.
Organisms are placed into these categories based on similarities or common characteristics. Some of the characteristics that are used to determine placement are cell type, nutrient acquisition, and reproduction. The two main cell types are prokaryotic and eukaryotic cells.
This kingdom includes animal organisms. These multicellular eukaryotes depend on plants and other organisms for nutrition. Most animals live in aquatic environments and range in size from tiny tardigrades to the extremely large blue whale.
When Linnaeus developed his system of classification, there were only two kingdoms, Plants and Animals. But the use of the microscope led to the discovery of new organisms and the identification of differences in cells. A two-kingdom system was no longer useful. Today the system of classification includes six kingdoms.