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Cell theory

In biology, cell theory is the historic scientific theory, now universally accepted, that living organisms are made up of cells. Cells are the basic unit of structure in all organisms and also the basic unit of reproduction. With continual improv ...

                                               

Cellulitis

Cellulitis is an infection of the skin, caused by bacteria. Very often, the face is affected. The disease should not be confused with cellulite. Cellulitis is caused by bacteria, usually staphylococcus or streptococcus, which can get through a br ...

                                               

Centipede

A centipede is a type of myriapod with many legs. Centipedes are predators. They hunt during the night; they are nocturnal. Some centipedes are venomous, but none can kill a person unless they are allergic. Centipedes are in the class Chilopoda, ...

                                               

Central nervous system

The central nervous system is the largest part of the nervous system. It is made up of the brain and the spinal cord. Together with the peripheral nervous system, it has an important role in the control of behaviour. The CNS is protected by bone ...

                                               

Ceratophyllum

Ceratophyllum is a genus of flowering plants, commonly found in ponds, marshes, and quiet streams in tropical and in temperate regions. Ceratophyllum grows completely submerged, usually, though not always, floating on the surface, and does not to ...

                                               

Ceriantharia

The tube-dwelling anemones are a subclass of the Anthozoa. They resemble sea anemones. Sea anemones have a base plate, tube-dwelling anemones do not. Most tube-dwelling anemones reproduce sexually. About 100 species have been described; most live ...

                                               

Cetacea

The order Cetacea are marine mammals that live in oceans, seas, and even a few rivers around the world. Whales, dolphins, and porpoises are part of this group. These common name refer to size: whales are the largest, porpoises the smallest. How a ...

                                               

Cetology

Cetology is a type of science. It is the study of the cetaceans. It includes whales, dolphins, and porpoises. Cetology is the branch of marine mammal science which studies approximately eighty species of whales, dolphins, and porpoise in the scie ...

                                               

Chaetocauda

The Chinese dormouse or Sichuan dormouse is a species of dormouse that lives in subalpine mixed forests in northern Sichuan, China. Only two female specimens have even been caught. These were both caught in the Wanglang Natural Reserve and was fi ...

                                               

Chaetognatha

Chaetognatha, commonly known as arrow worms, are a phylum of small predatory marine animals. They are present in huge numbers in plankton worldwide. About 20% of the known species are benthic and can attach to algae or rocks. They are found in al ...

                                               

Chamaeleo zeylanicus

The Indian Chameleon, Chamaeleo zeylanicus is a species of chameleon found in Sri Lanka, India and other parts of South Asia. Like other chameleons, this species has a long tongue, feet that are shaped into bifid claspers and a prehensile tail. I ...

                                               

Charadriiformes

Charadriiformes is a diverse order of small to medium-large birds. It includes about 350 species. It has members in all parts of the world. Most charadriiformes live near water and eat invertebrates or other small animals. However, some are pelag ...

                                               

Chattering rock frog

The chattering rock frog is a small frog from Australia. It lives in Western Australia. This frog can grow to 3.5 cm long. This frog can be dark red, light brown or gray in colour. It has some stripes on its head and body and some webbing on its ...

                                               

Cheesmans big-eyed tree frog

Cheesmans big-eyed tree frog is a tree frog from southeastern Papua New Guinea. The adult male frog is 4.8 to 5.7 cm long, and the adult female frog is 5.5 to 6.5 cm long. It can be light brown to dark brown or green-brown in color. It has very d ...

                                               

Southeast African cheetah

The Southeast African cheetah is the nominate subspecies of cheetah native to Southern Africa. It is the most abundant subspecies estimated at more than 6.000 individuals in the wild. Since 1990 and onwards, the population was estimated at approx ...

                                               

Chenopodioideae

The Chenopodioideae is a subfamily of flowering plants are family Amaranthaceae, formerly treated as a distinct family Chenopodiaceae and comprising all of the genera formerly included in this family except for those transferred to the subfamilie ...

                                               

Chihuahua (dog)

The Chihuahuas start goes back to Mexico as the descendants of the Techichi, a long haired and silent dog. The Techichi was liked by the Toltec people, one of the indigenous original people of Mexico. Chihuahuas are believed to have been made by ...

                                               

Chinchilla

The chinchilla is a relatively small rodent. They live in the Andes Mountains in South America. They are active during dusk and dawn. Such an activity pattern is named for crepuscular. Together with the Viscacha, they form the Chinchillidae famil ...

                                               

Chinese river dolphin

The Chinese river dolphin or baiji was a river dolphin. It was found only in the Yangtze River in China. The last confirmed sighting of the baiji was in 2004 but there were possible sightings in 2007 and 2016 as well. The baiji was declared funct ...

                                               

Chinstrap penguin

The chinstrap penguin is a penguin that gets its name from the narrow band of black feathers that goes under their "chin" from ear to ear. They are sometimes called the stone-cracker penguin’ because of their squeaky and high pitched call. Chinst ...

                                               

Chipmunk

A chipmunk is a small squirrel-like rodent. It is in the Sciuridae family. About twenty-three species fall under this title, with one species in North America. The name may have originally been spelled "chitmunk" perhaps from a Native American wo ...

                                               

Chloranthaceae

Chloranthaceae is the botanical name of a family of flowering plants. The family consists of four genera, totalling several dozen species, of herbaceous or woody plants occurring in Southeast Asia, the Pacific, Madagascar, Central & South America ...

                                               

Chlorophytum comosum

The Spider Plant, Chlorophytum comosum, is a species of Chlorophytum native to South Africa. Spider plants have long narrow leaves that are 20–40 cm 8–15 in long and 5–20 mm 0.2–0.8 in broad. They grow from a central rosette. It also produces bra ...

                                               

Cholesterol

Cholesterol is a molecule that is found in animal cells and body fluids. Cholesterol is not found in plant sources. It is a type of lipid which is a fat or fat-like molecule. Cholesterol is a soft waxy substance. Cholesterol is a special type of ...

                                               

Chondrostei

The Chondrostei are a sub-class of ray-finned fish, the Actinopterygii. They include the sturgeons, huge fish which provide caviar. The Chondrostei are mainly cartilaginous fish with some ossification. There are 52 species divided among two order ...

                                               

Chromatin

Chromatin is the complex combination of DNA and proteins that makes up chromosomes. It is found inside the nuclei of eukaryotic cells. Chromatin is divided into heterochromatin condensed and euchromatin extended forms. Heterochromatin is composed ...

                                               

Chronic stress

Chronic stress is stress that happens over a long period of time. It is different than acute stress, which happens over a short period of time and then goes away. Stress is a normal part of every living things daily life. However, when stress bec ...

                                               

Chukar

The chukar is a Eurasian upland gamebird in the pheasant family Phasianidae of the order Galliformes, gallinaceous birds. Other common names of this bird include Chukker, Chukar Partridge, Red-legged Partridge, Rock Partridge, Indian Hill Partrid ...

                                               

Chupacabra

El Chupacabra is a cryptid said to live in Puerto Rico, Mexico, Chile, Brazil, Anaheim California. Gilbert Arizona. Texas to Florida, Michigan, Maine and even Oregon. Its name comes from the Spanish translation of "goat sucker", because of its ha ...

                                               

Cinnamomum

Cinnamomum is a genus of evergreen trees and shrubs. All of them belong to the same family as the laurel, Laurelaceae. The species in the genus have aromatic oils in their leaves and bark. There are over 300 species in the genus. They can be foun ...

                                               

Cirsium

Cirsium is a genus of flowering plants in the family Asteraceae. It is one of many genera with the common name being thistles. Other genera known as thistles include Carduus, Cynara, Onopordon, and Silybum. They are mostly native to Eurasia and n ...

                                               

Climacoceratidae

Climacoceratide is a family of artiodactyls which lived in Miocene in Africa. Theyre closely related to giraffes, with some genera, like Prolibytherium previously classified as giraffes. The climacoceratids, named after one of their members, Clim ...

                                               

Clitoral glans

The clitoral glans is covered by the clitoral hood, which is attached to the labia minora. The whole structure is attached to the frenulum clitoridis and clitoral body which is internal.

                                               

Clownfish

The clownfish is a kind of fish. Clownfish habitat usually is a coral reefs. Clownfish live in the Indian Ocean and the Pacific Ocean, from north west Australia, the coast of South East Asia as far north as Japan. Often, they live in a symbiosis ...

                                               

Cluster headache

Cluster headaches are a type of headache. They are the least common type of headache. Cluster headaches are very painful. They usually cause very strong pain on one side of the head, behind the eye and temple. The headaches can last anywhere from ...

                                               

Coca

Coca is a plant in the family Erythroxylaceae, native to north-western South America. The plant plays a significant role in traditional Andean culture. Coca leaves contain cocaine alkaloids, a basis for the drug cocaine, which is a powerful stimu ...

                                               

Cochlea

The cochlea is the auditory portion of the inner ear. It is a spiral-shaped cavity in the bony labyrinth, making 2.5 turns around its axis. A core component of the cochlea is the Organ of Corti, the sensory organ of hearing, which is distributed ...

                                               

Cockatiel

Cockatiels are small birds originally from Australia and are related to many other cockatoos. They are the second most common bird species kept as a pet. Cockatiels can live from 10 to 25 years, depending on how healthy their lifestyle is, althou ...

                                               

Cocker Spaniel

Cocker Spaniel is the name for two dog breeds of the Spaniel type: The English Cocker Spaniel and the American Cocker Spaniel. Originally, these dogs were bred in England for hunting Eurasian Woodcock. Cocker spaniels are popular family pets. The ...

                                               

Cocoon

A cocoon is a shell made of silk by most kinds of moth caterpillars and other insect larvae. Some butterfly larvae do spin cocoons. However, most butterfly pupae are called chrysalids. Some caterpillars attach small twigs or pieces of vegetation ...

                                               

Colitis

Colitis is an ongoing digestive disease. The main symptom of the disease is swelling of the colon. Other symptoms include: high amounts of pain, tenderness in the abdomen, depression, large amount of weight loss, fatigue, and other, more severe s ...

                                               

Collared dove

Collared doves are relatively small and slim doves. Males and females look alike, with a pastel buff/grey body with pink accents and slightly darker grey on their wings and tail. It is about 32 cm long. They nest near inhabited buildings for pref ...

                                               

Collie

Collies form a type of herding dogs, including many similar landraces and standardized breeds. The type began in Scotland and Northern England. Collies are usually medium-sized, fairly lightly-built dogs, with pointed noses. Many breeds have a wh ...

                                               

Colobinae

The Colobinae are a subfamily of Old World monkeys. The family includes 61 species in 11 genera, including the Colobus monkeys, the large-nosed proboscis monkey, and the grey langurs. Some classifications split the colobine monkeys into two tribe ...

                                               

Colon

The colon is a part of the large intestine. It is between the cecum and the rectum. The colon takes water from the feces that goes through it. The colon in mammals can be divided into four sections: the ascending colon the transverse colon the si ...

                                               

Colorful puffleg

The colorful puffleg is a critically endangered hummingbird endemic to Colombia. The colorful puffleg population is estimated as about 250–999 adult birds. These colorful birds were first found in 1967 by photographer John Dunning who was below C ...

                                               

Colugo

Colugos are gliding mammals in the order Dermoptera. There are two living species, found in south-east Asia. They are also called flying lemurs, though they are not lemurs all lemurs are in Madagascar. They can glide long distances, as they have ...

                                               

Common big-eyed tree frog

The common big-eyed tree frog is a group of species of tree frog from Papua New Guinea. Scientists saw it on Mount Hagen in the Wahgi Valley region more than 2400 meters above sea level. The female frog is 6.4 cm long. It has side-to-side marks o ...

                                               

Common Chinese tree frog

The common Chinese tree frog or Chinese tree toad is a tree frog from China. People have seen it in the middle of China and in parts of Taiwan and Vietnam. It lives between 200 and 1000 meters above sea level. The adult frog is 2.5 to 3.3 cm in s ...

                                               

Common coqui

The common coqui or coqui is a species of frog. They live in Puerto Rico. The coqui is an important symbol of Puerto Rico. They are known for their loud calls they make at night. They belong to the genus Eleutherodactylus.