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Over 1.5 million living animal species have been described—of which around 1 million are insects—but it has been estimated there are over 7 million in total. Animals range in size from 8.5 millionths of a metre to 33.6 metres (110 ft) long and have complex interactions with each other and their environments, forming intricate food webs .
Biologists can study life at multiple levels of organization, [1] from the molecular biology of a cell to the anatomy and physiology of plants and animals, and the evolution of populations. [1] [6] Hence, there are multiple subdisciplines within biology, each defined by the nature of their research questions and the tools that they use.
The following outline is provided as an overview of and topical guide to zoology: . Zoology – study of animals.Zoology, or "animal biology", is the branch of biology that relates to the animal kingdom, including the identification, structure, embryology, evolution, classification, habits, and distribution of all animals, both living and extinct, and how they interact with their ecosystems.
The encyclopedia was an international collaboration by a large number of scientists including Theodor Haltenorth, Wolfgang Gewalt, Heinz-Georg Klös, Konrad Lorenz, Heinz Heck, Lutz Heck, Jean Dorst, Constantine Walter Benson, Irenäus Eibl-Eibesfeldt, Helmut Sick, Heini Hediger, Wolfgang Makatsch, Erich Thenius, Erna Mohr, Adolf Portmann ...
Synthetic biology – research integrating biology and engineering; construction of biological functions not found in nature. Botany – study of plants. Economic botany – study of relationship between people and plants, including the practical uses of plants; Ethnobotany – study of a region's plants and their usage by people
The encyclopedia of animals: A complete visual guide. University of California Press, 2004. ISBN 0520244060. [1] Burton, Maurice, Robert Burton. International wildlife encyclopedia. Marshall Cavendish, 2002. ISBN 0761472665. [1] Encyclopedia of Animal Behavior. Facts on File, 1987. [6] Encyclopedia of Animal Biology. Facts on File, 1987. [6]