he was working with species of Java, so perhaps some tropical snakes are unusual in this respect.

Of these, 1, 356 ( 33. 6 %) were considered to be threatened and this figure is likely to be an underestimate because it excludes 1, 427 species for which there was insufficient data to assess their status.

Agriculture was the key development in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that nurtured the development of civilization.

In 2008, it was discovered that the inactivation of only two genes in one species of annual plant leads to the conversion into a perennial plant.

Although most extant species of Asteraceae are herbaceous, the examination of the basal members in the family suggests that the common ancestor of the family was an arborescent plant, a tree or shrub, perhaps adapted to dry conditions, radiating from South America.

A number of species have come to be considered invasive, including, most notably in North America, dandelion, which was originally introduced by European settlers who used the young leaves as a salad green.

This fossil was originally described as a species of Australopithecus, but White and his colleagues later published a note in the same journal renaming the fossil under a new genus, Ardipithecus.

The type species, A. sarcophagus, was apparently restricted in range to the modern-day Canadian province of Alberta, after which the genus is named.

It is improbable, however, that the production of amber was limited to a single species ; and indeed a large number of conifers belonging to different genera are represented in the amber-flora.

He was considered the 19th century's leading expert on the geographical distribution of animal species and is sometimes called the " father of biogeography ".

The species was introduced into cultivation at the beginning of the eighteenth century.

No one knows the exact species it was crossed with to produce color variations of white, cream, peach, magenta and nearly red hues.

The program was successful in terms of increasing the population of blue foxes, but their predation of Aleutian Canadian geese conflicted with the goal of preserving that species.

By 1987 a comprehensive survey of the phylum was completed: in all, 4516 species and 339 genera had been named.

When a group of different plant species was prompted by a variety of different stress signals, such as drought or cold, each plant responded uniquely.

Animal species diversity was also significantly impacted: in one study, a Harvard biologist found 24 species of birds and 5 species of mammals in a sprayed forest, while in two adjacent sections of unsprayed forest there were 145 and 170 species of birds and 30 and 55 species of mammals.

According to Ferdinand Bohlmann, the first naturally occurring acetylenic compound, dehydromatricaria ester, was isolated from an Artemisia species in 1826.

The substance so defined was a species.

One of these was the property, an essential universal true of the species, but not in the definition ( in modern terms, some examples would be grammatical language, a property of man, or a spectral pattern characteristic of an element, both of which are defined in other ways ).

A species of Paranthropus, such as Paranthropus robustus, with its crested skull and bipedal gait, was suggested by primatologist John Napier and anthropologist Gordon Strasenburg as a possible candidate for Bigfoot's identity, despite the fact that fossils of Paranthropus are found only in Africa.

The study found that there was ' no verifiable evidence ' of exotic felines loose in Britain, and that the mauled farm animals could have been attacked by common indigenous species.

It seems to me that the first human being to reach one of these planets may well learn what it is to be a truly great and noble species ''.

He concluded that in the southern species, which are rapidly growing types, females mate at the age of two and a half and bear the first young when they are three.

On chemical grounds it seems most likely that iodide is first converted to Af and then to Af as the active iodinating species.

For a chemical process the first of these might involve the concentrations of the different chemical species, and the temperature or pressure of the stream.

Wallace did extensive fieldwork, first in the Amazon River basin and then in the Malay Archipelago, where he identified the Wallace Line that divides the Indonesian archipelago into two distinct parts, one in which animals closely related to those of Australia are common, and one in which the species are largely of Asian origin.

Bosschaert became one of the first artists to specialise in still life, and in doing so he started a tradition of painting detailed flower bouquets, which typically consisted of tulips, roses and an exotic species.

Although those of many marine species function first as males and then as females, their colonies always contain a combination of zooids that are in their male and female stages.

He used a two-part naming scheme where the first name represented the genus and the second the species.

This weedy species in the mustard family ( Brassicaceae ) was one of the first plants to have its genome sequenced.

Strutt ( Sports and Pastimes ) suggests that the first player's bowl may have been regarded by the second player as a species of jack ; but in that case it is not clear what was the first player's target.

Other common names for the blue whale have included Sibbald's rorqual ( after Sibbald, who first described the species ), the great blue whale and the great northern rorqual.

The first known usage of the term blue whale was in Melville's Moby-Dick, which only mentions it in passing and does not specifically attribute it to the species in question.

Carnivorans have either four or five digits on each foot, with the first digit on the forepaws, also known as the dew claw, being vestigial in most species and absent in some.

Hesperocyonine canids first appeared in North America, and the earliest species is currently dated at 39. 74 mya, but they were not represented in Europe until well into the Miocene, and not into Asia and Africa until the Pliocene.

After five to six weeks these are weaned and become fully mature near the end of their first year or sometime in their second year, depending on the species.

The rapid diversification of lifeforms in the Cambrian, known as the Cambrian explosion, produced the first representatives of many modern phyla, representing the evolutionary stems of modern groups of species, such as the arthropods.

This was in contradiction to Ernst Haeckel's theory that the complete phylogeny of a species would be repeated during embryonic development, including generation of the first nucleated cell from a " Monerula ", a structureless mass of primordial mucus (" Urschleim ").

However, molecules that are larger than the average pore size of the packing are excluded and thus suffer essentially no retention ; such species are the first to be eluted.

*** Canis edwardii () †, first species of wolf in North America )

*** Canis ( Eucyon ) cipio ( 8. 2 Ma †, probably first species of Canis genus )

One of the first proposed estimates of the total number of beetle species on the planet is based on field data rather than on catalog numbers.

All cultures have creation myths ; they are our primary myths, the first stage in what might be called the psychic life of the species.

In the second volume of the first edition of Principles Lyell explicitly rejected the mechanism of Lamark on the transmutation of species, and was doubtful whether species were mutable.