The earliest tetrapods are grouped under Class Amphibia, despite several of the groups being more closely related to Amniotes than to modern day amphibians.

Amniotes can be characterized in part by embryonic development that includes the formation of several extensive membranes, the amnion, chorion, and allantois.

Amniotes soon expanded their diets to include plants and larger animals, both vertebrate and invertebrate, permitting larger body size.

Amniotes and Diadectomorpha are sometimes grouped together using the old name Cotylosauria, a name originally used for the most basal grade of what was then thought to be reptiles.

The greenhouse frog ( Eleutherodactylus planirostris ) lays eggs in small groups in the soil where they develop in about two weeks directly into juvenile frogs without an intervening larval stage.

AVMs are lesions of the vasculature that develop such that blood flows directly from the arterial system to the venous system without passing through a capillary system.

Expenditure on science and technology to develop weapons and systems sometimes produces side benefits, although some claim that greater benefits could come from targeting the money directly.

China continues to develop its telecommunications infrastructure, and is partnering with foreign providers to expand its global reach ; 3 of China's 6 major telecommunications operators are part of an international consortium which, in December 2006, signed an agreement with Verizon Business to build the first next-generation optical cable system directly linking the United States and China.

Political opponents counter that it would be far cheaper to develop specific technologies directly if they are beneficial and scoff at this justification for public expenditures on space-related research.

In a few species, the trochophore does not develop directly into the adult, but into an intermediate pelagosphaera stage, that possesses a greatly enlarged metatroch ( ciliated band ).

The parts that are autotomised or the buds may develop directly into fully formed larvae or may develop through a gastrula or even a blastula stage.

Hemichordates are classically known to develop in two ways, both directly and indirectly.

Those species that are direct developing bypass this prolonged larval stage and develop directly into an adult worm.

Most of what has been detailed in Hemichordate development has come from hemichordates that develop directly.

Furthermore, Cameron's production company had to design and build experimental equipment and develop a state-of-the-art communications system that allowed the director to talk underwater to the actors and dialogue to be recorded directly onto tape for the first time.

Later, Intel CPUs had larger address spaces and could directly address 16-Megabytes ( MiBs ) ( 80286 ) or more, causing Microsoft to develop extended memory ( XMS ) which did not require additional hardware.

He quickly adopted the epistolary novel form, which granted him " the tools, the space, and the freedom to develop distinctly different characters speaking directly to the reader ".

The study of openings in Chess960 is in its infancy, but fundamental opening principles still apply, including: protect the king, control the central squares ( directly or indirectly ), and develop rapidly, starting with the less valuable pieces.

Historically optical microscopes were easy to develop and are popular because they use visible light so that samples may be directly observed by eye.

Thus, when circumstances combine, people become exposed, either directly or via food or water, and can develop an infection.

For instance, while spiders proceed directly from egg to adult form many insects develop through at least one larval stage

Tentacules, tentacles directly associated with odontodes, develop on the pectoral fin spine of the males of some species.

The Quartermaster Branch's insistence on canned wet rations for all postwar field issue, and the failure to develop a suitable lightweight dehydrated or other dry ration for jungle and other extreme environments led directly to the hurried development of the LRP ration or Long Range Patrol ration in 1966.

The 3D gameplay allows damaging side and back throws as a reward for outmaneuvering the opponent, as well as evasive attacks that develop directly from a sidestep.

In chronic hepatitis B, however, the integration of the viral genome into infected cells can directly induce a non-cirrhotic liver to develop HCC.

It aims to " develop the technical, professional, scientific, research, planning and management capability of Pacific Island people and directly provide information and advice, to enable them to make informed decisions about their future development and well-being.

It has taken hundreds of years to develop our understanding of the brain and how it directly affects our behaviors, and hundreds of great minds committed to discovering the way our bodies work and function both normally and abnormally.

He says the state, in order to proceed with economic development, must develop an understanding of how the various parts of its economy fit together and dovetail into the national economy.

conduct, encourage, and promote fundamental scientific research and basic studies to develop the best and most economical processes and methods for converting saline water into water suitable for beneficial consumptive purposes ; ;

And even if they stay in resorts part of the time, they might, if the right salesman gets them in tow, develop a yearning to spice the usual vacation fare with a camping trip into the wide open spaces.

The route which he had traveled and which he believed might develop into a trade route was followed by his settlers earlier than he might have expected.

Erikson has noted that, unless this trust developed early, the time ambivalence experienced, in varying degree and temporarily, by all adolescents ( as a result of their remembering the more immediate gratification of wants during childhood, while not yet having fully accepted the long-range planning required by adulthood ) may develop into a more permanent sense of time diffusion.

The diffusion is most pronounced and most likely to become fixed, however, in those who have had no or very minimal opportunities to develop the autonomy and initiative that could have been directed into constructive expression and so served as sources of developing self-certainty.

Some members of the genera Ambystoma and Dicamptodon have larvae that never fully develop into the adult form but this varies with species and with populations.

The skin thickens, embedded scales develop and the body divides into segments.

* Browser games can be applet-based, though some may develop into fully functional applications that require installation.

In Jarry's later work Ubu Roi, Père Heb would develop into Ubu, one of the most monstrous and astonishing characters in French literature.

In 2003, the SCO Group alleged that ( among other infractions ) IBM had misappropriated licensed source code from UNIX System V Release 4 for incorporation into AIX ; SCO subsequently withdrew IBM's license to develop and distribute AIX.

So they decided to also develop their own alternative in the form of an improved floppy disk controller and printer interface that could be built right into a floppy disk enclosure.

In those days I was just getting into contrapuntal and choral writing ... and I wanted to develop my technique by writing a trio.

This funeral also helps the poet to develop the plot to lead into the confrontation between the protagonist, Beowulf, and the main antagonist, Grendel.

The Bahá ' í teachings state that the attributes which are applied to God are used to translate Godliness into human terms and also to help individuals concentrate on their own attributes in worshipping God to develop their potentialities on their spiritual path.

After a few divisions, the egg cell is placed into a uterus where it is allowed to develop into a fetus that is genetically identical to the donor of the original nucleus.

The Lambert Report into the channel's performance in 2002 called upon News 24 to develop a better brand of its own, to allow viewers to differentiate between itself and similar channels such as Sky News.

These ancient breeds then migrated South ( founding the Tazi / Saluki branch ) and West ( founding the Stepnaya, Krimskaya and Hortaya branches ) to develop into breeds adapted to those regions.

Apodanthaceae are obligatory endoparasites that only emerge once a year in the form of small flowers that develop into small berries.

This sparked up a process of political evolution that saw him develop into a full-fledged supporter of socialism.

A word may also enter another language, develop a new form or meaning there, and be re-borrowed into the original language ; this is called a Rückwanderer ( German for " one who wanders back ").

It takes between 12 and 60 days for the tadpoles to develop into toadlets, with four weeks being typical.

The emergence of the samurai aristocracy led to the development of armoured horse archers, themselves to develop into charging lancer cavalry as gunpowder weapons rendered bows obsolete.