In biology, a kingdom is a taxonomic rank that is composed of smaller groups called phyla (or divisions, in the case of plants). The current system of classification recognizes five kingdoms: Animalia, Plantae, Fungi, Protista, and Monera (or Prokaryotae).
The Animalia kingdom includes all animals. These are multicellular, eukaryotic organisms that are heterotrophic, meaning they obtain their nutrients by consuming other organisms. They are further classified into various phyla based on their characteristics and evolutionary relationships.
The Plantae kingdom encompasses all plants. These are multicellular, eukaryotic organisms that are autotrophic, meaning they produce their own food through photosynthesis. They include a wide variety of organisms, from small mosses to large trees.
The Fungi kingdom consists of organisms such as mushrooms, molds, and yeasts. These are eukaryotic organisms that are mostly multicellular (though some are unicellular) and obtain nutrients through absorption. They play important roles in decomposition and nutrient cycling in ecosystems.
The Protista kingdom is a diverse group that includes various single-celled eukaryotic organisms such as algae, amoebas, and ciliates. Some members of this kingdom exhibit plant-like characteristics, while others resemble animals. The classification of protists is still a subject of ongoing research and debate.
The Monera kingdom, also referred to as Prokaryotae, consists of prokaryotic organisms such as bacteria and archaea. These organisms are unicellular and lack a true nucleus. They are found in a wide range of habitats and play crucial roles in various ecological processes.