Anura is divided into three suborders which are broadly accepted by the scientific community but the relationships between some families remains unclear.

With the availability of primary sources, such as the those in Nag Hammadi library, the identity of Abrasax remains unclear.

To what extent Snorri's presentation is poetic creation only remains unclear.

His exact date of death remains unclear as well, with most research pointing toward it being between April 14, 1202, and April 5, 1203.

The legal process required at the federal level remains unclear.

How indigenous peoples discovered the synergistic properties of the plants used in the ayahuasca brew remains unclear.

It remains therefore unclear where exactly the Central European origins of the Boii lay, if somewhere in Gaul, Southern Germany or in Bohemia.

Hence it remains unclear why any of it is conscious.

The exact taxonomic placement of New World Vultures remains unclear.

As such, it remains unclear if knuckle cracking is in itself associated with any impaired hand function.

It remains unclear if Paul was even himself married.

It remains unclear when, why, and by whom the earliest dolmens were made.

Since these canids are called dholes only in English, the etymology remains unclear, but it may have come from (‘ wolf ’).

Their relationship to the Asfarviridae and the Myoviridae was not examined and remains unclear.

Nevertheless, their relationship with all other Orthodox Churches remains unclear, as ' Orthodox ' Churches normally recognize and are recognized by others.

Whether Shakespeare took these from Belleforest directly or through the Ur-Hamlet remains unclear.

Nevertheless the immense acceleration process that occurs during hyperinflation ( such as during the German hyperinflation of 1922 / 23 ) still remains unclear and unpredictable.

Gutenberg's technique of making movable type remains unclear.

Although the exact nature and extent of the Christian redaction remains unclear there is broad consensus as to what the original text of the Testimonium by Josephus would have looked like.

It remains unclear why John chose to marry Isabella of Angoulême.

It is currently unclear whether 21, 000-year-old campfire remains found in the Valley of Mexico are the earliest human remains uncovered so far in Mexico.

Instead, in yeast, it has been shown to be dependent on a multiprotein tethering structure termed the ER-mitochondria encounter structure, or ERMES, although it remains unclear whether this structure directly mediates lipid transfer or is required to keep the membranes in sufficiently close proximity to lower the energy barrier for lipid flipping.

Despite extensive research into the interaction of modafinil with a large number of neurotransmitter systems, a precise mechanism or set of mechanisms of action remains unclear.

The origin of the river's name remains unclear.

Whether any of us remain in it long will depend on what happens as a result of the technological and economic revolutions now going on in the countries of Asia and Africa, and also of course on how long the cold war remains cold.

This much having been said, the question remains whether we have the resources for the job we have to do -- defeat Communism -- and, if so, how those resources ought to be used.

Even for present-day neuroscience, the mechanisms by which brain activity gives rise to consciousness and thought remain very challenging to understand: despite rapid scientific progress, much about how the brain works remains a mystery.

Although clearly both genetic and environmental input is needed for a child to develop normally, considerable debate remains about how genetic information might guide cognitive development.

At the moment, it is not known how the material is produced or if it remains stable without applied pressure, however, there is conjecture that it is possible to produce a new stable state of matter by compressing ultracold deuterium in a Rydberg state.

Replacing statements including " to be " with those using becomes, remains and equals divides perception of, and expressions about, time more operationally into actual cognitive categories that humans know how to act upon:

The civil war remains the most traumatic, controversial and emotionally charged event in the history of modern Finland, and there have even been disputes about how to designate it.

The Basic Law's Article 45 stipulates that the ultimate goal is universal suffrage ; when and how to achieve that goal, however, remains open but controversial.

Heidi Weiss of the Chicago Sun-Times said of the play " Far more surreal and twisted than Tom Stoppard's Rosencrantz and Guildenstern are Dead, 12 Ophelias is a reminder of just how morphable and mysterious Shakespeare's original remains.

However, the interpretation of early paleolithic artifacts, with regard to how they relate to religious ideas, remains controversial.

Canceling an order is idempotent, because the order remains canceled no matter how many requests are made.

" Vice-Admiral Voss, being asked how he identified the people as Goebbels, his wife and children, explained that he recognized the burnt body of the man as former Reichsminister Goebbels by the following signs: the shape of the head, the line of the mouth, the metal brace that Goebbels had on his right leg, his gold NSDAP badge and the burnt remains of his party uniform.

This may seem unlikely since Ieyasu was in his 70s and was in poor health already, but it remains unknown how Musashi came into Ieyasu's good graces.

The archaeology of shipwrecks can be divided into a three-tier hierarchy, of which the first tier considers the wrecking process itself: how does a ship break up, how does a ship sink to the bottom, and how do the remains of the ship, cargo and the surrounding environment evolve over time?

The exact timescale for how long this smoke remains, and thus how severely this smoke affects the climate once it reaches the stratosphere, is dependent on both chemical and physical removal processes.

While the relationship of the African species is comparatively straightforward, a large number of Asian species of Ostrich have been described from fragmentary remains, and their interrelationships and how they relate to the African Ostriches is confusing.

The estrangement between the secular and the spiritual authority which Ganganelli strove to avert is now irreparable, and his pontificate remains an exceptional episode in the general history of the Papacy, and a proof how little the logical sequence of events can be modified by the virtues and abilities of an individual.

After a limiting distance ( about the size of a hadron ) has been reached, it remains at a strength of about 10, 000 newtons, no matter how much farther the distance between the quarks.

Even though about 95 percent of Swedish school children know how to swim, drowning remains the third most common cause of death among children.

Where and how iron smelting was discovered is widely debated, and remains uncertain due to the significant lack of production finds.

The earlier models have no fuel gauge ; a dipstick is inserted into the tank to determine how much fuel remains.

" He also questioned whether people would fully see its message, ".. how Serious People will take this Trivial Comedy intended for their learning remains to be seen.