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Argyroxiphium

Argyroxiphium is a small genus of plants in the sunflower family, Asteraceae. Its members are known by the common names of silversword or greensword due to their long, narrow leaves and the silvery hairs on some species. The Silversword plant gro ...

                                               

Arm

An arm is a limb. Most humans have two arms each, coming out of their body at the shoulder, just below the neck. On the end of each arm is a hand. Humans use arms and hands to do things to other objects, this is called manipulation. The main purp ...

                                               

Armoured frog

The armoured frog, armoured mist frog or Alexandra Creek tree frog is a frog from Australia. It lives in Queensland. The adult male frog is 2.7 to 3.3 cm long and the adult female is 3.3 to 3.7 cm long. It is gray or brown in color with a white b ...

                                               

Arthus reaction

In immunology, the Arthus reaction is a kind of local allergic reaction, when antibodies react to a chemical or protein in a persons blood, and have the antibodies get stuck in the walls of blood vessels in organs such as the heart, in joints, an ...

                                               

Artichoke

The artichoke or globe artichoke is a perennial plant of the Asteraceae family. They first came from Southern Europe around the Mediterranean. The thick scales and bottom parts of the young flower heads can be eaten. They are a culinary delicacy. ...

                                               

Ascaphidae

Ascaphidae is a family of frogs. They are called tailed frogs because they have an organ that looks like a tail. The tail helps them to live in fast-moving streams. They live in North America.

                                               

Asclepias amplexicaulis

Asclepias amplexicaulis, also known as the clasping milkweed, is a species of milkweed plant. It is also known as blunt-leaved milkweed sand milkweed. It is in the subfamily Asclepiadoideae. It is native to eastern North America. The blooming per ...

                                               

Asclepias incarnata

Asclepias incarnata is a species of milkweed plant. It is also known as the swamp milkweed, the rose milkweed, the pink milkweed, the swamp milkweed, and white Indian hemp. It belongs in the subfamily Asclepiadoideae. It is native to North Americ ...

                                               

Asclepias speciosa

Asclepias speciosa is a species of milkweed plant. It belongs in the subfamily Asclepiadoideae. It is native to western North America. It blooms from May to July. This species is found in savannas, prairies, meadows, and fields.

                                               

Asclepias tuberosa

Asclepias tuberosa is a species of milkweed plant. It belongs in the subfamily Asclepiadoideae. It is native to North America. It blooms from June to September. The flowers are orange, red-orange, or yellow. This species is found in prairies, mea ...

                                               

Aseptic meningitis

Meningitis happens when the brains lining becomes inflamed. This lining is called the meninges. Aseptic meningitis occurs when there are signs of meningitis. However, when a sample of brain fluid is taken, bacteria do not grow. This condition is ...

                                               

Asian black bear

The Asian black bear, also called asiatic black bear, white chested bear or himalayan black bear, is a medium-sized, sharp-clawed, black-colored bear with a distinctive white or cream "V" marking on its chest. It is also known as the Asiatic blac ...

                                               

Asian emerald cuckoo

The Asian emerald cuckoo is a species of cuckoo in the Cuculidae family. It lives in Southeast Asia, in Bangladesh, Bhutan, Cambodia, China, India, Indonesia, Laos, Malaysia, Myanmar, Nepal, Sri Lanka, Thailand, and Vietnam. The Asian emerald cuc ...

                                               

Asian house shrew

The Asian house shrew is a type of shrew. It is native to South and Southeast Asia. It is the largest type of shrew. It is a least concern species. It has been introduced in several West Asian and East African countries. It is an invasive species.

                                               

Asian openbill

The Asian openbill or Asian openbill stork is a large bird in the stork family Ciconiidae. This stork lives in the Indian subcontinent and Southeast Asia.

                                               

Asian small-clawed otter

The Asian small-clawed otter is a type of otter. It is also called the oriental small-clawed otter or simply small-clawed otter. It is native to South and Southeast Asia. It is the smallest type of otter in the world. It is also the smallest type ...

                                               

Asian tiger mosquito

The Asian tiger mosquito, or forest day mosquito is a kind of mosquito that is native to tropical and subtropical South-East Asia. It has black and white striped legs, and small black and white striped body. The Asian tiger mosquito is about 2 to ...

                                               

Asiatic lion

The Asiatic lion is a subspecies of the lion. It survives today only in India, where it is also known as the Indian lion. They once ranged from Southeast Europe to India, covering most of Southwest Asia, and hence it is also known as the Persian ...

                                               

Asparagales

Asparagales is an order of flowering plants. The order must include the family Asparagaceae, but other families included in the order have varied markedly between different classifications. No one is sure, but it is supposed that this group of pl ...

                                               

Aspidogastrea

The Aspidogastrea is a small group of flukes. There are about 80 species. The group is a subclass of the Trematoda, and sister group to the Digenea. Species are between approximately one mm to several cm long. They are parasites of freshwater and ...

                                               

Assimilation (biology)

Assimilation in biology, is the combination of two processes which get nutrients for cells. The first in animals is eating and digesting food. Food is absorbed and broken down. This is done by physical breakdown chewing and stomach churning, then ...

                                               

Astacus astacus

The astacus is a species of crayfish in Europe. Like other crayfish, the astacus lives in fresh water. It can live in streams, rivers, and lakes if it is not polluted. The astacus can be found living in France, Central Europe, Balkan peninsula, t ...

                                               

Aster (genus)

Aster is a genus of flowering plants. It belongs in the family Asteraceae. The genus once had nearly 600 species in Eurasia and North America. After morphologic and molecular research on the genus during the 1990s, it was decided that the North A ...

                                               

Asterales

The Asterales are an order of flowering plants which include the composite family Asteraceae and its related families.

                                               

Asteridae

Asteridae is a Linnaean term with the rank of subclass. By definition it always includes the family Asteraceae. However, in the modern APG III system of classification, asterid and euasterid are names for clades. Their member families are similar ...

                                               

Asterids

In the APG II system, for the classification of flowering plants, asterids are a clade of eudicots. That means they are a monophyletic group. The clade includes 17 orders in the traditional Linnaean system. Common examples include the forget-me-n ...

                                               

Astrocytoma

An astroctytoma is a form of a brain tumor that comes from astrocytes. There are many kinds of astrocytomas. They are separated into two categories; Low-grade astrocytomas and High-grade astrocytomas.

                                               

Astrodon

Astrodon was a long-necked plant-eating dinosaur, a relation of Brachiosaurus. The sauropod was about 30 feet long. It lived during the Lower Cretaceous period, about 130 million to 120 million years ago. Astrodon is known from teeth and scattere ...

                                               

Atelopus ignescens

The Atelopus ignescens was a species of toad. It was often known as the Jambato toad or the Quito stubfoot toad. They belonged to the family Bufonidae. They lived in Ecuador. Their habitat was subtropical or tropical high-altitude. It was believe ...

                                               

Atlantic herring

The Atlantic herring is a kind of herring, a fish. It can be found on both sides of the Atlantic. It can grow up to 45cm in length, weighing more than half a kilogram. It is a swarm fish, meaning many fish come together and form a school of fish. ...

                                               

Atlantic mackerel

The Atlantic mackerel, is a pelagic schooling species of mackerel found on both sides of the North Atlantic Ocean. The species is also called Boston mackerel, or just mackerel. The Atlantic Mackerel is by far the most common of the ten species of ...

                                               

Atlas (anatomy)

In anatomy, the atlas is the top cervical vertebra of the spine. In anatomy, the atlas is written for short. It is named for the Atlas of mythology, because it supports the head in the same way as Atlas held the world on his shoulders. The atlas ...

                                               

Aucasaurus

Aucasaurus was a medium-sized theropod dinosaur from Argentina that lived during the Upper Cretaceous. It was smaller than its relative Carnotaurus. It had extremely short arms. Its skeleton is the most complete abelisaurid skeleton discovered so ...

                                               

Australian lace-lid

The Australian lace-lid, Days big-eyed tree frog or lace-eyed tree frog is a tree frog from Australia. It lives in northeastern Queensland. The adult frog is 5.0 cm long. Unlike other male frogs, which can sing in groups, male Australian lace-lid ...

                                               

Australopithecus afarensis

Australopithecus afarensis is an extinct hominid. It lived between 3.9 and 2.9 million years ago. A. afarensis was similar to slightly later Australopithecus africanus. It had a slender build. A. afarensis may be more closely related to the genus ...

                                               

Autonomic nervous system

The autonomic nervous system controls the conditions inside the body. It is sometimes called the visceral nervous system or involuntary nervous system. The ANS is part of the peripheral nervous system. ANS controls all automatic actions. That mea ...

                                               

Avialae

Avialae is a term for birds and their immediate extinct ancestors. It is a clade of dinosaurs containing their only living representatives and whatever coelurosaurs are regarded as their ancestors. There are two ways it can be defined:

                                               

Avimimus

Avimimus was a recently discovered maniraptoran. It was a very fast moving, light-weight, bird-like theropod dinosaur that lived in the late Cretaceous in what is now Mongolia, around 70 million years ago. that may have had feathers. There are tw ...

                                               

Axilla

The axilla is the area on the human body right under where the joint where the arm connects to the shoulder. The axilla is one of the four places where an medical thermometer can be used to measure human body temperature. The other places are the ...

                                               

Axon

The axon is the part of a neuron that sends the signal to the synapse. Axons are long, thin and tendril-like. Axons are much like a highly developed dendrite. The axon carries an electrical signal from the cell body soma to the synapse. There the ...

                                               

Babirusa

The babirusas are a genus Babyrousa, in the pig family found in Wallacea, or specifically the Indonesian islands of Sulawesi, Togian, Sula and Buru. They are often called deer pigs. All members of this genus were considered part of a single speci ...

                                               

Badjcinus

Badjcinus was an animal that belonged to the extinct marsupial family Thylacinidae. It was one of the most primitive members of its group, living 33 to 32 million years ago in the early Oligocene. It was quite small, averaging 5.2 lbs 2.4 kg in w ...

                                               

Bagaceratops

Bagaceratops was a plant-eating dinosaur that had a bony ridge along the back of its skull. This ceratopsian dinosaur lived during the late Cretaceous period, roughly 84 to 71 million years ago. Bagaceratops fossils have been found in Mongolia.

                                               

Baileys tree frog

Baileys tree frog is a frog that lives in Brazil. Scientists have seen it as high as 800 meters above sea level. The adult male frog is 1.8 to 2.0 cm long and the adult female frog is 2.2 to 2.3 cm long. The eyes stick out from the head. The nose ...

                                               

Ballota

Ballota is a genus of about 35 species of flowering plants in the family Lamiaceae, native to temperate regions of Europe, north Africa and western Asia, with the highest diversity in the Mediterranean region. They are used as food plants by the ...

                                               

Baobab

Baobab is the common name of a genus of trees. There are a total of eight types of its kind: six species live in the drier parts of Madagascar, two in mainland Africa, one in Australia and three in India. It is the national tree of Madagascar.

                                               

Barbourofelis

Barbourofelis is an extinct genus of large, carnivorous, mammals. They were a type of saber-toothed cat. The genus was found in North America during the Miocene to Pleistocene. They lived from 13.6 – 5.3 million years ago mya, which is about 8.3 ...

                                               

Barn swallow

The barn swallow is the most widespread species of swallow that can be found worldwide. A distinctive passerine bird with blue upperparts, a long, deeply forked tail and curved, pointed wings, it is found in Europe, Asia, Africa and the Americas. ...

                                               

Barosaurus

Barosaurus was a large, long-necked, plant-eating dinosaur which lived about 156 to 145 million years ago. The name Barosaurus means "heavy lizard"; this giant was named by paleontologist Othniel C. Marsh in 1890. Barosaurus fossils have been fou ...

                                               

Barracuda

A barracuda is a ray finned-fish that is about 6 feet in length. It is found in tropical and subtropical oceans worldwide. It is of the genus Sphyraena, the only genus in the family Sphyraenidae. Infamous for its intimidating and ferocious behavi ...