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Animals in Biological Definition

Albinism

... 3 Genetics 4 Culture 5 Albinism in animals 6 External links Lack of ... See also: List of albinos Albinism in animals Albinism is not restricted to the human species—other animals also carry these genes. Albinism tends to be more ...

Animal

... (mollusks) Annelida (segmented worms) animals are a major group of organisms , classified as ... on. Aristotle divided the living world between animals and plants , and this was followed by Carolus ... microscopic protozoa were originally considered animals because they move, but are now treated ....

Biology

... ( pH ); at the organismal level warm-blooded animals maintain a constant internal body temperature; ... physiology and considers how organ systems in animals such as the nervous , immune , endocrine , ... is the discipline which involves the study of animals , which includes the physiology ...

Brain

... please see its article. In the anatomy of animals , the brain , or encephalon , is the ... Brains in nature Although many classes of animals have nervous systems, three groups of animals, ... the brain, called gyri , are characteristic of animals with more advanced brains. These convolutions ...

Carnivore

... York named Carnivore . Carnivores are animals that eat a diet consisting mostly of meat . ... only) insects are called insectivores . animals that are true carnivores A true carnivore is ... . Many dinosaurs and other extinct animals were carnivores, for example the well known ...

Charles Darwin

... investigations of the life cycle of marine animals on the shores of the Firth of Forth where Grant ... for homology , the radical theory that all animals had similar organs differing only in complexity. ... followed up by The Expression of Emotions in animals and Man . Darwin produced practical explanations ...

Common descent

... nor order: all of these latter have perished. animals lacking a mouth could not live; others lacking ... Darwin , hypothesized that all warm-blooded animals were descended from a single "living filament": ... it be too bold to imagine, that all warm-blooded animals have arisen from one living filament, which THE ...

Cryptozoology

... is the study of rumored or mythological animals that are presumed (at least by the researcher ... reported. Those who study or search for such animals are called cryptozoologists , while the ... monumental 1955 book, On The Track of Unknown animals is often seen as the disipline's genesis, but ...

Cold-blooded

... more technically known as poikilothermic , are animals that have no internal metabolic mechanism for ... their body temperatures. Some (usually smaller) animals have unregulated temperatures, but most have ... temeprature from the environment. Cold-blooded animals are often referred to as ectotherms . ...

Warm-blooded

... known as endotherms , warm-blooded animals control their body temperature by regulating ... and a constant body temperature, allowing these animals to be active in cold temperatures. On the other ... possible speed and efficiency. Warm blooded animals warm themselves by digesting food. The ...

Evolution

... billion years, simple multicellular plants and animals began to appear in the oceans. Soon after the emergence of the first animals the Cambrian explosion (a period of unrivaled ... refers to the way human beings, as cultured animals capable of symbolic (extrasomatic) learning, can ...

Foot and mouth disease

... also infect deer , goats , sheep , and other animals with cloven hooves, as well as elephants , rats ... feet that may rupture and cause lameness. Adult animals may suffer weight loss from which they do not ... can decline significantly. Though most animals eventually recover from FMD, the disease can lead ...

Fungus

... like mold and mildew . Parasitic fungi infect animals , including humans , other mammals , birds , ... . Exoenzymes act like the digestive enzymes of animals , breaking apart large organic molecules, but ... now thought to be more closely related to the animals and choanoflagellates . These groups are known ...

Herbivore

... however, and many fruit- and leaf-eating animals also eat other parts of plants, notably roots and seeds . The diets of some herbivorous animals vary with the seasons, especially in the ... times of year. Here is a list below that includes animals that are unable to chew or digest animal matter. ...

Hermaphrodite

... showTocToggle("show","hide") 1 In animals 2 In plants 3 Etymology 4 Reference In animals Sequential hermaphrodite : The organism is ... . Hermaphrodism in plants is more complex than in animals because plants can have hermaphroditic flowers as ...

Human

... nature, and their dominance over other animals have given rise to attempts to explain the ... . The term "person" is thus used of non-human animals , and could be used of a mythical being , an ... animal" ( animal loquens ), though non-human animals are now known to use language too, and non-human ...

Animal

... (mollusks) Annelida (segmented worms) animals are a major group of organisms , classified as ... on. Aristotle divided the living world between animals and plants , and this was followed by Carolus ... microscopic protozoa were originally considered animals because they move, but are now treated ....

Osmoregulation

... by osmosis from the side containing pure water. animals in all environments (aquatic and terrestrial) ... plants 4 Osmoregulation in protoctists and animals 5 Vertebrate excretory systems 5.1 ... the rate of transpiration. Plants share with animals the problems of obtaining water and in disposing ...

Paleontology

... of life on earth, of ancient plants and animals based on the fossil record , evidence of their ... in invertebrate paleontology , which deals with animals without backbones, or in vertebrate paleontology , dealing with fossils of animals with backbones, including fossil hominids ( ...

Polysaccharide

... can break the alpha- linkages. Humans and other animals have amylases, so they can digest starches. ... Glycogen is the storage form of glucose in animals . It is a branched polymer of glucose. Glycogen ... by beta- linkages. Humans and many other animals lack an enzyme to break the beta- linkages, so ...

Thermoregulation

... that any exact data on the temperature of animals could be obtained. It was then found that local ... of internal parts, or in women and some animals the vagina, uterus or bladder. Occasionally ... regulation 1.1 Heat gains and losses in animals 2 Types of thermoregulation 3 ...

Unsolved problems in biology

... Self . What is it? Why is it necessary for many animals (especially mammals ) to sleep ? Or dream , ... Why is magnetite in living creatures? How do animals possess long-range navigation and migration ... was the homing ability developed? How can some animals detect earthquake precursors ? What are ...

Zoology

... discipline which involves the study of animals . Contents showTocToggle("show","hide") ... to both plants and animals. The biology of animals is covered in several broad areas: The physiology of animals is studied under various fields including ...

Anatomy

... (embryology) and comparative anatomy (morphology), as far as vertebrate animals are concerned; but only those parts of the lower animals which are of interest in explaining human body structure are here dealt ...

Apoptosis

... , or the development of organisms from fertilized eggs to fully-developed animals and plants. It has also suggested specific answers to why normal cells ... in the previous section on development, all tissue in multicellular animals depends on continuous receipt of survival signals. In the case of T cells, ...

Reproduction

... days) produces up to 900. Both strategies can be favoured by evolution : animals with few offspring can spend time nurturing and protecting them, hence greatly decreasing the need to reproduce; on the other hand, animals with many offspring do not need to spend parental energy on nurturing, ...

Autotroph

... heterotrophs ) can utilize as food . Thus, heterotrophs — animals , fungi , as well as most bacteria and protozoa — depend on ... by breaking down organic molecules in their food. Even carnivorous animals rely on autotrophs because the energy and organic building blocks obtained ...

Biodiversity

... animal origin are wool , silk , fur , leather , lubricants , waxes. animals may also be used as a mode of transport . Tourism and recreation : ... for many areas, such as many parks and forests , where wild nature and animals are a source of beauty and joy for many people. Ecotourism in ...

Bone

... structures, or organs , into which it is formed, found in many animals . Bones support body structures, protect internal organs , and (in ... can be affected by arthritis . Cut and polished bone from a variety of animals is sometimes used as material for jewelry and other crafts. ...

Cancer

... an approach seems promising, the next step may be testing a treatment in animals to see how it affects cancer in a living being and whether it has harmful effects. Of course, treatments that work well in the lab or in animals do not always work well in people. Studies are done with cancer patients ...

Cloning

... clone extinct species is the need for nearly perfect DNA. Furthermore, if animals were cloned from one individual, the significant problem of lack of ... development of cloning, there are many other applications, such as cloning animals (eg. cattle and horses ), which appears to offer a much faster and more ...

Escherichia coli

... species of bacteria that live in the lower intestines of warm-blooded animals (including birds and mammals ) and are necessary for the proper ... of dogs, and different strains of E. coli live in different kinds of animals , so it is possible to tell whether fecal material in water came from ...

Enzyme

... down blood stains). Digestive and metabolic enzymes Nutrition in animals relies on digestive enzymes such as salivary amylase , trypsin and ... Chymosin : better known as rennet, contained in the stomachs of many animals and causes milk to curdle Chymotrypsin : can digest proteins ...

Eukaryote

... material is organized into membrane - bound nuclei . They include the animals , plants , and fungi , which are mostly multicellular, as well as ... may be assigned to several supergroups: Opisthokonts animals , fungi , choanoflagellates , etc. Amoebozoa Most lobose ...

Homeostasis

... the environment to determine the parameter. For instance, endothermic animals maintain a constant body temperature, while ectothermic animals exhibit wide variation in body temperature. This is not to say that ...

Meiosis

... of chromosomes precedes the process of meiosis (during S phase ). Most animals and plants are normally diploid, and use meiosis to produce sexual gametes , which fuse to form zygotes that develop into new organisms. In most animals this is often the primary or only means of proliferation. In other ...

Muller's ratchet

... never go back. By contrast, sexual reproduction allows most plants and animals to create offspring with good copies of two genes via crossover. That is, ... while another animal has two normal copies of the gene, a mating of these animals can produce offspring with the advantageous mutation and without the ...

Mycology

... fungi not being plants and being evolutionarily more closely related to animals than plants). Pioneer mycologists were Elias Magnus Fries , Christian ... and socially important as they are responsible for diseases of animals as well as plants like Potato blight (actually, an oomycete ). Field ...

Nervous system

... senses , and initiates actions . (see Central Nervous System ). In animals with brains , the nervous system also generates and conducts thoughts and ... . Vertebrate nervous systems The nervous systems of vertebrate animals are often divided into a central nervous system (CNS) and the ...

Olfaction

... sense of smell , is the detection of chemicals dissolved in air (or, by animals that breathe water, in water). In vertebrates smells are sensed by the ... Olfaction The importance of smell, and pheromones, to Humans and other animals Structure-odor relations: a modern perspective (PDF) ...
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