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Skin cancer

Skin cancer is the term that is used for all bad forms of growth of the skin. In everyday use, people often talk about melanoma, but there are other forms of skin cancer, too. These are usually named after the type of cell that grows uncontrollab ...

                                               

Skin tag

A skin tag is a small growth on the skin that is usually benign. It may have a short narrow stalk which connects it to the skin. They are usually small but may grow up to a half-inch long.

                                               

Skink

Skinks are a family of small lizards, the Scincidae. There are over 1.500 different species of skink. Skinks are different from other lizards. They have very small legs and necks. Some have no legs at all; these move more like snakes than lizards ...

                                               

Skull

A skull, or cranium, is a set of bones that make up the head of a vertebrate and keep in place all body parts in the head. It supports the structures of the face and forms a protective cavity for the brain. As well as protecting the brain, the sk ...

                                               

Skye terrier

The Skye terrier is a breed of dog. It is medium sized with short legs, a long body, and a large head. It has a long coat of hair that protects the animal from injury and bad weather. It is one of the oldest terrier breeds, and has its origins on ...

                                               

Sleeping sickness

"Sleeping sickness" is also another name for Narcolepsy. Sleeping sickness, or African trypanosomiasis, is an infectious disease. It is caused by parasites from the species Trypanosoma brucei. People get African trypanosomiasis from the tsetse fl ...

                                               

Slender salamander

Slender salamander is a common name given to lungless salamanders of the genus Batrachoseps. They are different from other lungless salamanders. They have four toes on each foot. They live in Oregon, California and Baja California in Mexico.

                                               

Slender tree frog

The slender tree frog is a tree frog from Australia. It lives in southwestern Australia. These frogs can grow to 4.5 cm long. They are pale brown to bright green in colour. They have stripes down their sides. Adult frogs live near the coast or in ...

                                               

Small intestine

The small intestine is between the stomach and the large intestine, and is where most of the digestion and absorption happen. In humans over five years old, the small intestine is about 7.5 meters long. The small intestine has three regions: the ...

                                               

Sneeze

A sneeze is a reaction in the nose in which air and mucus are forced out quickly. It often happens after breathing dust or other small things into the nose. When people sneeze, their eyes close. This is a natural reflex which keeps the eyes from ...

                                               

Social spider

A social spider is a species of spider which lives in a group. Most spiders are solitary, but a few species in tropical habitats live in large groups. This social organisation has evolved independently a number of times. At least 23 species in ei ...

                                               

Socorro dove

The Socorro dove is a dove that was endemic to Socorro Island on the west coast of Mexico. The last bird was seen there in 1972. For this reason, IUCN has classified the species as extinct in the wild. In captivity, there are not more than about ...

                                               

Solifugae

Solifugae is an order of arachnids sometimes called camel spiders, wind scorpions or sun spiders. Although they look rather like spiders, they are not spiders, and they are not scorpions. The order includes more than 1.000 species in about 153 ge ...

                                               

Sooty Barbthroat

The sooty barbthroat is a species of hummingbird. It is found in French Guiana and far north-eastern Brazil. Its habitat is humid tropical lowland forest. Though normally restricted in range, it is common enough to be thought a Species of Least C ...

                                               

Sophora davidii

Sophora davidii is a deciduous shrub from south-west China. It can grow up to 3 metres tall. It has blue and white pea flowers and is also known a David mountain laurel. It has been gathered in Texas.

                                               

Sophoreae

Sophoreae is a tribe of Fabaceae. This tribe, that have relatively simple flowers and unspecialized pinnate leaves and quinolizilidine alkaloids, appears as polyphyletic

                                               

Sorex

The genus Sorex includes many of the common shrews of Eurasia and North America. It contains at least 142 known species and subspecies. They are in the tribe Soricini of the subfamily Soricinae.

                                               

Southern cassowary

The southern cassowary, also known as double-wattled cassowary or two-wattled cassowary, is a large flightless black bird with hard and stiff plumage, two dangling red wattles and a big bony lump on its head called a casque. It lives in tropical ...

                                               

Spathiphyllum

Spathiphyllum, generally known as peace liliy, is a genus of 50-60 species of the flowering plants. They are native to America and South East Asia. Because of their decorative leaves, and long-lasting flowers, several of them are popular housepla ...

                                               

Specific phobia

Specific phobias are a generic form of anxiety condition which consists of unreasonable or irrational fears of exposure to specific objects or certain situations. Affected people tend to avoid direct contact with such objects or situations, somet ...

                                               

Spencers river tree frog

Spencers tree frog, Spencers river tree frog or the spotted tree frog is a tree frog from Australia. It lives near the Great Dividing Range in Victoria and New South Wales. It lives between 200 and 1100 metres above sea level. The adult frog is 4 ...

                                               

Sphingidae

Sphingidae is a family of moths, commonly known as hawk moths, sphinx moths and hornworms. It includes about 1.450 species. It is best represented in the tropics but there are species in every region. They can fly fast, and their wings can be lin ...

                                               

Spinal tumor

Depending on their location, the spinal cord tumors can be: Extramedullary- inside the dura, but outside the spinal cord Intramedullary - inside the spinal cord Intradural - part of the dura Extradural - outside the dura mater lining most common

                                               

Spiny lobster

Spiny lobsters, also known as rock lobsters are a family of about 45 species of crustaceans, in the Decapoda Reptantia. Spiny lobsters are also called crayfish, sea crayfish or crawfish. Although they superficially resemble true lobsters in terms ...

                                               

Spiracle

Insects have small holes in their bodies that allow them to breathe. These holes are called spiracles. Air comes in the spiracles and goes to invertebrate trachea, or tubes. These tubes take the oxygen to other parts of the insect body. Because i ...

                                               

Spiraeoideae

The Spiraeoideae is an old name for a subfamily of flowering plants in the family Rosaceae. Until 2007, the subfamily name was used for a group of plants that are mostly shrubs and have small dry fruit. In 2007, the subfamily was made much larger ...

                                               

Spoonbill

Spoonbills are a group of large, long-legged wading birds in the family Threskiornithidae, which also includes the Ibises. All have large, flat, spatulate bills and feed by wading through shallow water, sweeping the partly-opened bill from side t ...

                                               

Spotted sandpiper

Spotted sandpipers are 7.1-7.9 in 18-20 cm long. It weighs 1.2-1.8 oz 34-50 g. It has a wingspan of 14.6-15.8 in 37-40 cm. Adults have short yellowish legs and an orange bill with a dark tip. The body is brown on top and white underneath with bla ...

                                               

Spotted-thighed frog

The spotted-thighed frog or spotted-thighed tree frog is a tree frog from southwestern Australia. Spotted-thighed frogs are dark green or brown with yellow spots on their backs. They have bright yellow spots on their legs. It looks like its relat ...

                                               

Spruce

Spruce are trees of the genus Picea, a genus of about 35 species of coniferous evergreen trees in the Family Pinaceae, found in the northern temperate and taiga regions of the earth. Spruces are large trees, from 20–60 –95 m tall when mature, and ...

                                               

Staffordshire Bull Terrier

The Staffordshire Bull Terrier, sometimes nicknamed as a Staff, is an English dog breed.It is a medium-sized dog- Originally, it was bred for dog fighting. It is related to the Bull Terrier. Its appearance is similar to the American Staffordshire ...

                                               

Staurozoa

The Staurozoa are a Class in the phylum Cnidaria. It includes the stalked jellyfish. It was an order within the Class Scyphozoa, but recent genetic work has shown it to be a class of its own. This is a small class of about 50 species, mostly insh ...

                                               

Steatorrhea

Steatorrhea means excess undigested fat in feces. In this case, the feces is often lighter, sometimes whitish, in color. It produces a fouler-than-usual, sour-rancid smell, and floats on the surface of the water as opposed to sinking to the botto ...

                                               

Stegoceras

Stegoceras was a small, plant-eating dinosaur that had a large, thick-skulled head. This dinosaur may have butted heads with others of its kind in bone-shaking contests. Many Stegoceras and other pachycephalosaur fossils have been found in Albert ...

                                               

Stegodon

Stegodon is a genus of the extinct subfamily Stegodontinae of the order Proboscidea. Stegodonts were present from 11.6 million years ago to the late Pleistocene. There are unconfirmed records of regional survival until 4.100 years ago. Fossils ar ...

                                               

Stenonychosaurus

Stenonychosaurus is a genus of troodontid dinosaur from the Late Cretaceous of Alberta, Canada based on a foot, fragments of a hand, and some caudal vertebrae. A 2017 description had redeemed the validity of Stenonychosaurus and had informalised ...

                                               

Stenopterygius

Stenopterygius was a typical, dolphin-shaped ichthyosaur of the Lower Jurassic. It is like the poster reptile of the ichthyosaur family, Ichthyosaurus, but with slightly narrower flippers and a smaller head. Its name means "narrow wing". Stenopte ...

                                               

Stentor

Stentor is a genus of filter-feeding ciliates. They are usually horn-shaped, and reaching lengths of 2 millimeters, they are among the biggest known unicellular organisms. They are a type of protist ciliate in the heterotrich class. The old-fashi ...

                                               

Stinging nettle

Stinging nettles are a type of plant which have stinging defensive hairs on the leaves and stems. Stinging nettles can be found in America, Europe and Asia.

                                               

Stonefly

The Stonefly or Plecoptera are an order of aquatic insects. There are some 3.500 described species worldwide, and new ones are still being discovered. Although stoneflies are found worldwide, they are absent from Antarctica. Stoneflies are believ ...

                                               

Stop codon

A stop codon, or termination codon, is special sequence in the genetic code. It is a nucleotide triplet in messenger RNA that signals the end of translation. It is a codon that is, a sequence of three nucleotides in messenger RNA. It indicates th ...

                                               

Stork

Storks are a family of birds. They usually live near shallow bodies of water where they wade through the water, and catch small animals, like frogs, crabs, or small fish. Many species of stork are migratory, they spend the summer and the winter i ...

                                               

Strawberry

A strawberry is a short plant in the wild strawberry genus of the rose family. The name is also used for its very common sweet edible "fruit" and for flavors that taste like it. The real fruit of the plant are the tiny "seeds" around the "fruit", ...

                                               

Strepsiptera

Strepsiptera is a order of insects, any of about 600 species of small insects that are notable for their bizarre form of parasitism. Strepsipterans are parasitic in planthoppers, leafhoppers, treehoppers, froghoppers, bees, and other insects.

                                               

Striped burrowing frog

The striped burrowing frog, greenstripe frog, or Australian striped treefrog is a tree frog from Australia. It lives in Queensland, New South Wales and the Northern Territory. This frog lives in forests and in grasslands that are covered in water ...

                                               

Striped rocket frog

The striped rocket frog, streamlined rocket frog, Australian rocket frog or rocket frog is a frog from Australia and the island of New Guinea. This frog can grow to 4.5 cm in size. It has a long body and a pointed nose and only a little webbing o ...

                                               

Stubbs (cat)

Stubbs was an American cat who was the mayor of Talkeetna, Alaska from July 1997 until his death in July 2017. Until early 2017, Stubbs was still mayor, and has been described as a tourist attraction. At least one opinion writer for the Alaska Di ...

                                               

Subcutaneous tissue

The Subcutaneous tissue is sometimes also called the hypodermis. It is the bottom layer of skin of an animal or plant, right below the dermis, which is below the epidermis. The diagram is incorrect by a typo error: The stratum germinativum is the ...

                                               

Subspecies

Subspecies is a classification in biology. It is directly below species. When looking at the Latin name, subspecies are indicated by the third name. Subspecies can mix with each other; animals or plants from different subspecies can have offsprin ...

                                               

Sugarcane

Sugarcane is a genus of plants. There are between 6 and 37 types of sugarcane. Sugarcane grows in warm and tropical climates. It first grew in Asia, but after the year 700 people started planting it in Africa and southern Europe. Later it spread ...