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Hypacrosaurus

Hypacrosaurus was a large, plant-eating, hollow-crested duck-billed dinosaur similar to Corythosaurus. It was about 30 feet long, had almost 40 rows of cheek teeth, and a short toothless beak. A row of long spines from its vertebrae formed a high ...

                                               

Hyperglycemia

Hyperglycemia means high blood sugar levels at or beyond 200 mg/dl. It is a serious and life threatening health problem that can be fatal if not properly treated in time. In a healthy body, insulin helps glucose sugar get from the blood into the ...

                                               

Hypermobility

Hypermobility refers to when human joints stretch further than is usual. For example, some people can bend their thumbs back to their wrist, their toes backwards, put their leg behind their heads or any other ways of unusual performances. This co ...

                                               

Hyperopia

Hyperopia is a problem with the focusing ability of the eye. People with hyperopia have an easier time seeing things that are far away than seeing things that are up close. Inside the eye is the lens which can change shape to change the focusing ...

                                               

Hyperthyroidism

Hyperthyroidism is a medical condition. It is caused by a thyroid gland that is too active. The thyroid gland makes hormones. These hormones manage the body’s metabolism. An example of one of these hormones is thyroxine. The thyroid-stimulating h ...

                                               

Hypoactive sexual desire disorder

Hypoactive sexual desire disorder is a sexual condition that is characterized by the lack of sexual fantasy and desire for sexual activity. For this to be judged as a disorder, the condition has to cause strong distress or interpersonal troubles, ...

                                               

Hypoglycemia

Hypoglycemia is a medical emergency that involves lower than normal blood sugar. Normal blood sugar is about 70 to 100mg per deciliter. All of the cells in the body need sugar to do their jobs and to survive. When a person does not have enough bl ...

                                               

Hypothalamus

The hypothalamus is a brain part at the base of the brain. It connects the endocrine system to the nervous system. The word hypothalamus is a Greek word which means "under the thalamus"; it is used because hypothalamus is below the thalamus, and ...

                                               

Hyrax

Hyrax also called dassie is any of four species of fairly small, thickset, herbivorous mammals in the order Hyracoidea, any of six species of small hoofed mammal native to Africa and extreme southwestern Asia. Hyraxes are well-furred rotund creat ...

                                               

Iberian lynx

The Iberian lynx is a feline. It is similar to other versions of the genus Lynx. The Iberian lynx has almost no threats except man, but it is almost extinct. It is the most endangered cat species in the world. Iberian lynx hunt rabbits. One of th ...

                                               

Ibis

The ibises are a group of long-legged wading birds in the family Threskiornithidae. They all have long down curved bills, and usually feed as a group, probing mud for food items, usually crustaceans. Most species nest in trees, often with spoonbi ...

                                               

Icelandic horse

Icelandic horses are a breed of horse that resist the cold, have two unique gaits, and are a breed with special names. Icelandics in winter get really fluffy coats, helping keep the cold out. The icelandics also have two unique gaits, one of whic ...

                                               

Ichthyophthirius multifiliis

Ichthyophthirius multifiliis, also called "white spot disease", "ick" or "ich" is a disease that causes little white spots on fresh water fish. It is one of the most common parasites of fish. It often affects pet fish in tanks and ponds, as well ...

                                               

Icterid

The Icteridae are a family of small to medium-sized New World songbirds. They are usually brightly colored. Most species have black as a main plumage color, often enlivened by yellow, orange or red. The family is extremely varied in size, shape, ...

                                               

Impatiens

Impatiens is a genus of about 850–1.000 species of flowering plants, widely distributed throughout the Northern Hemisphere and tropics. Together with Hydrocera triflora, they make up the family Balsaminaceae. These plants derives their scientific ...

                                               

In vitro fertilisation

In vitro fertilisation is a way to let sperm fertilise egg cells outside of the womb. IVF is used so that infertile women may still have children. IVF is done by: A sample of sperm is taken The fertilised egg zygote is then injected into the woma ...

                                               

Indian mackerel

The Indian mackerel is a species of mackerel in the scombrid family of order Perciformes. It is commonly found in the Indian and West Pacific oceans, and their surrounding seas. It is an important food fish and is commonly used in South and South ...

                                               

Indohyus

Indohyus is a small deer-like creature, which lived about 49 or 48 million years ago in Kashmir, India. It belongs to the artiodactyls family Raoellidae, and is believed to be the closest sister group of Cetacea. It lived during the same time as ...

                                               

Indonesian big-eyed tree frog

The Indonesian big-eyed tree frog is frog from southeastern Papua New Guinea. It was first found by western scientists when they were camping by the Idenburg River. The scientists who saw it were camping 50 meters above sea level. Later, it was a ...

                                               

Infertility

Infertile means not able to have children or other offspring. Humans can be infertile, but animals and plants can too. When a human couple is infertile, they sometimes have fertility treatment to have children. This can be insemination or IVF. Th ...

                                               

Inflammation

Inflammation is the first reaction of the immune system to an infection or irritation. First the organ involved gets red, then it will get hot, then it will swell, and then it will hurt. Finally it will stop working. The first four of these react ...

                                               

Intercostal muscle

The intercostal muscles are a group of skeletal muscles between the ribs. These muscles help expand and shrink the size of the chest cavity to help breathing. When breathing in, the muscles of the diaphragm contract. This pulls the diaphragm down ...

                                               

Interferon

Interferons are proteins released by body cells in response to pathogens such as viruses, bacteria, parasites or to tumor cells. They allow cells to trigger the defenses of the immune system. IFNs belong to the large class of glycoproteins known ...

                                               

Interspecific competition

In ecology, interspecific competition is when individuals of different species compete for the same resources, in an ecosystem. Examples for such resources are food, or space. Even species that never meet can compete with each other, because they ...

                                               

Intestine

The intestines, divided into the small intestine and the large intestine, of an animal are like a tube through which food and bile from the stomach move. The first part of the small intestine is called the duodenum, where most food is broken down ...

                                               

Ion channel

An ion channel is a pore-forming protein that helps to establish and control the small voltage gradient across the plasma membrane of all living cells by allowing the flow of ions down their electrochemical gradient. They are present in the membr ...

                                               

Iriomote cat

The Iriomote cat is a wildcat that lives only on Iriomote Island in Japan. It is a subspecies of the leopard cat. In Japanese, people call it yamaneko, or "mountain cat." This cat is a little larger than a domestic cat, with rounder ears and spot ...

                                               

Iron deficiency anemia

Iron-deficiency anemia is a common type of anemia. It is caused by not having enough iron in food, not absorbing the iron in food, and/or losing iron because of bleeding. Iron deficiency causes approximately half of all anemia cases worldwide, an ...

                                               

Ironbark

Ironbark is a common name of a number of species within the genus Eucalyptus that have dark, deeply furrowed bark. Many eucalypts shed their bark very year, but on an Ironbark the dead bark stays on the trees, forming the furrows. It becomes roug ...

                                               

Irregular bone

The irregular bones are bones that from their peculiar form, cannot be grouped as long bone, short bone, flat bone or sesamoid bone. Irregular bones serve some special purpose in the body: 1 protection of nervous tissue such as the vertebrae prot ...

                                               

Irritator

Irritator is a genus of spinosaurid theropod dinosaur that lived in what is now Brazil during the Lower Cretaceous. Its fossils are known from the Romualdo Formation. Irritator had straight and cone-shaped teeth. Its jaws were low, long and slend ...

                                               

Irukandji jellyfish

The Irukandji Jellyfish, Carukia barnesi, is a species of jellyfish. It lives in the waters of northern Australia. It is a very deadly jellyfish. The Irukandji is only 2.5 centimeters in diameter. This makes it hard to find. The Irukandji is beli ...

                                               

Ischemic colitis

Ischemic colitis is a medical condition in which inflammation and injury cause an inadequite blood supply to the large instestine. It occurs more often in older people. In fact, more than 90% of cases occur in people over the age of 60. Ischemic ...

                                               

Isopod

Isopods are animals that belong to an order of peracarid crustaceans. This order is called Isopoda. The name Isopoda derives from the Greek roots and. Some isopod species live in water, like the tongue louse. Others live on land, like woodlice an ...

                                               

Jacaranda mimosifolia

Jacaranda mimosifolia is a sub-tropical tree native to Asia that has been widely planted elsewhere because of its beautiful and long-lasting blue flowers. It is also known as jacaranda, blue jacaranda, black poui, or as the fern tree. Older sourc ...

                                               

Jacksons chameleon

Jacksons chameleon, also known as the horned chameleon, Jacksons horned chameleon, or Kikuyu three-horned chameleon, is a species of chameleon found in the forests of Kenya and Tanzania. They have been introduced to the United States and Hawaii.

                                               

Jalapeño

The jalapeño is a type of Mexican pepper. It is related to the family of the Chili pepper. It is pronounced hala-PAYN-nyo or hala-PEE-nyo. It is a reasonably spicy pepper. A chipotle is a smoked, dried jalapeño.

                                               

Japanese morning glory

Japanese morning glory, also called the Ipomoea nil, is an attractive cultivated plant, a climbing annual commonly with white edges, also named white-edge morning glory. It is found in US Florida to South America, also in Galapagos Islands.

                                               

Japanese squirrel

The Japanese squirrel is a mammal endemic to Japan. Japanese squirrels live on the main island of Honshu, Japan. They are locally extinct in Hokkaido. Japanese squirrels eat Japanese walnuts. They eat vegetable matter except seeds during spring. ...

                                               

Japanese weasel

The Japanese weasel is a carnivorous mammal belonging to the family Mustelidae. It lives in Honshu, Shikoku and Kyushu of Japan. Major habitats are plains, but in western Japan it mainly lives in mountainous areas.

                                               

Jasmine

Jasmine is a genus of plants. They are shrubs or vines that grow in moderately warm climates. There are about 200 different species of Jasmine. They are also quite liked in gardens. Tea can be made from the flowers. Some species are used to make ...

                                               

Jasminum officinale

For thousands of years, the Jasmine has been cultivated not only for the beauty of its small, white, star-like flowers, but also for its intoxicating scent. It is native to the foothills of the Western Himalayas and the Indus Valley plains of the ...

                                               

Jaw

For the movie about a shark, see Jaws movie. The jaw is the part of an animals body that it uses to grab and chew food. In humans, the jaws are two bones in the mouth, the mandible and maxilla, that let the teeth move up and down in order to chew ...

                                               

Jefferson salamander

The Jefferson salamander is a mole salamander. They live in northeastern United States, southern Ontario and southwestern Quebec. It was named after Jefferson College in Pennsylvania. It is usually dark gray, brown or black. Others can have silve ...

                                               

Jejunum

The jejunum is a section of the small intestine between the duodenum and the ileum. It is between 1 and 2 meters long.The term "jejunum" derives from the Latin "jejunus," which means "empty of food," "meager," or "hungry." The ancient Greeks noti ...

                                               

Jervis Bay tree frog

The Jervis Bay tree frog is a frog from Australia. It lives near the ocean in New South Wales, Queensland and Victoria. It does not live in Jervis Bay. These frogs have yellow colouring where their front legs meet their bodies. They live in eucal ...

                                               

Joubert syndrome

Joubert syndrome is a genetic birth defect. The cerebellum of people with the disorders is not developed normally. The disorder does not occur very often. Since its first description in 1969, a few hundred cases have been described. It is a cilio ...

                                               

Juncaceae

The Juncaceae, the rush family, is a family of rather small plants that often look like a type of grass. They often grow on wet, infertile soils. There are about 400 species organised into eight genera. Juncus is the most well-known and largest g ...

                                               

Jungguy frog

The jungguy frog is a tree frog from Australia. It lives in Queensland. This frog lives in rainforests near the Barron River and east to the Mirray River. Some of these frogs also live near the Broken River. The adult male frog is 3.1 to 4.8 cm l ...

                                               

Juniper

Junipers is the name for a number of species of coniferous plants in the genus Juniperus. They are related to the family Cupressaceae. There are between 50 and 67 species of juniper. Junipers grow in the northern hemisphere. Junipers are evergree ...