Speciation is the process by which new species of organisms arise. Earth is inhabited by millions of different organisms, all of which likely arose from one early life-form that came into existence about 3.5 billion years ago. It is the task of...

Speciation is the formation of a new species by dividing one species into two. Two species are considered to be separate if the individuals cannot reproduce to produce viable offspring (those that are fertile and cannot produce offspring of their own)....

The term used to describe the phenomenon of changes within a single species such as to produce two new and (in some way) distinctly different species. It occurs as a result of the isolation of two groups of the same species who then go on to develop in...

Speciation can be defined, in a general way, as the various processes by which new species arise. Speciation mechanisms can be categorized in several ways. Some species arise by the divergence of two or more new species from a single common ancestral...

Speciation is the evolutionary process by which new biological species arise. There are four modes of natural speciation, based on the extent to which speciating populations are geographically isolated from one another: allopatric, peripatric,...

New examples o fsympatric speciation revive some nagging questions | By Leslie Pray "A new species develops if a population which has become geographically isolated from its parental species acquires during this period of isolation characters which promote or guarantee reproductive isolation when...

Arsenic is ubiquitous in the environment but its effects are highly dependent on its chemical forms. Arsenic has been known as a poison for centuries. Arseneous oxide ([As.sub.2][O.sub.3]), a colourless and tasteless powder, was a favourite homicidal agent during the Middle Ages,...

Contrasts the different ideas between Mayr and Darwin leading to speciation. Describes the importance of geographic isolation as the driving force behind speciation.