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However, U-shaped fossil burrows that could be Echiuran have been found dating back to the Cambrian.
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However and U-shaped
However, some rivers do manage to reach the Pacific, including the Loa River, whose U-shaped course across the desert makes it Chile's longest river.
However, U-shaped pillows can sometimes force the head forwards creating neck stiffness.
However and fossil
However, as the preservation of behaviour in the fossil record is exceedingly rare, these ideas cannot readily be tested.
However, the fossil record for frog families and genera is uneven.
However, human activities, primarily the burning of fossil fuels and clearing of forests, have intensified the natural greenhouse effect, causing global warming.
However, no other fossil is known that would be preferable.
However, he maintained that a certain ' materia pinguis ' or ' fatty matter ,' set into fermentation by heat, gave birth to fossil organic shapes, as opposed to fossil shells having belonged to living animals.
However, the energy density of hydrogen is considerably higher than that of electric batteries, making it a serious contender as an energy carrier to replace fossil fuels.
However, recent fossil evidence from Queensland suggests that the Komodo dragon evolved in Australia before spreading to Indonesia.
However, the fossil record retains evidence of many of these older species.
However, despite these limitations, the inclusion of fossils is invaluable, as they can provide information in sparse areas of trees, breaking up long branches and constraining intermediate character states ; thus, fossil taxa contribute as much to tree resolution as modern taxa.
However, it was shown by Bennett that the type specimen later designated for Diopecephalus was a fossil belonging to P. kochi, and no longer thought to be separate from Pterodactylus.
However, the punctuational equilibrium model may still be inferred from both the observation of stasis and examples of rapid and episodic speciation events documented in the fossil record.
However, there has been little luck in getting closer to the true answer, especially because there are almost 10 million years worth of fossil records missing.
However, organisms and ecosystems, as far as it can be determined by the fossil record, do not appear to have undergone the significant change that would be expected by a mass extinction.
However, by that time, nuclear power may have largely replaced fossil fuels as a means of energy production.
However, this was not accepted by the taxonomic community at large ; the name S. harrisii has been retained and S. laniarius relegated to a fossil species.
However, the fossil record of the microscopic non-mineralized group is ( perhaps unsurprisingly ) scarce, so it is difficult to trace out the phylum's evolutionary history in any detail.
However, fossil evidence is scant, and it is really only with the evolution of the diatoms themselves that the heterokonts make a serious impression on the fossil record.
However, the precise timing of the " take-over " is unclear, and different authors have conflicting interpretations of the fossil record.
However, the economic system relied on massive concessionary inputs of fossil fuels, primarily from the Soviet Union and the People's Republic of China.
However, in 2010, Melott & Bambach found strong evidence in the fossil record confirming the extinction event periodicity originally claimed by Raup & Sepkoski in 1984, but at a higher confidence level and over a time period nearly twice as long.
However, with the industrialisation of farming and the wider use of fossil fuels the traditional use and management of the Fen began to decline.
However it is certain that their genesis lies earlier than this, as there are large gaps in Australia's fossil record and virtually no fossil record at all in geologically active New Guinea.
However and burrows
However, occasional " loose colonies " may be formed, whereby " some species of jerboa dig communal burrows which offer extra warmth when it is cold outside ".
However, black-footed ferrets used non-mounded prairie dog burrows ( 64 %) more often than mounded burrows ( 30 %) near Meeteetse, Wyoming.
However, mantis shrimp are considered pests by other aquarium hobbyists because many smasher species create burrows in the exoskeletons of dead corals.
However, even during the earliest decades of the study of ichnology, some fossils were recognized as animal footprints and burrows.
However, it mostly occupies burrows built by other mammals.
However, on Banks Peninsula, some birds can be observed on land outside their burrows during daylight.
However, there is no monopolization of burrows.
However, Bradfield observed pygmy rabbits range up to from their burrows.
However and could
However, the system is designed, ingeniously and hopefully, so that no one man could initiate a thermonuclear war.
However, last night the tapes were not run at all during the evening hours and all we got on TV were a few snatches which Douglas Edwards and Huntley and Brinkley could squeeze into their programs.
However, if Federal funds are used, it would be entirely appropriate to train workers for jobs which could be obtained elsewhere as well as for jobs in the area of chronic unemployment.
However, it would require all data transmission to send eight bits when seven could suffice.
However, this tenfold increase in population over the course of a few generations could not be achieved by increased birthrate alone ; likely it also involved migrations of peoples from surrounding areas.
However, the team could not sustain its status and is now back in the second division.
However, Tiberius didn ’ t allow her to marry Saloninus, because of political implications the marriage could have.
However, his succession could not have been foreseen at the time, as Alfred had three living elder brothers.
However, in practice they proved to be too large to manoeuvre well in the close waters of estuaries and rivers, the only places in which a ' naval ' battle could occur.
However, king Amadeus could do little within the rarefied peninsular political climate.
However, Amalric could not remain there indefinitely, and returned to Jerusalem after exacting an enormous tribute.
However, unlike the Spectrum, the single-keypress keyword-entry was optional, and keywords could be entered manually if preferred.
However, music spanning several octaves could be played by repeated calls to a machine-language tone generator.
However, there were also properties which could not be explained, including the non-spherical distribution of charge in certain nuclei.
However, his training in Wolgemut's studio, which made many carved and painted altarpieces and both designed and cut woodblocks for woodcut, evidently gave him great understanding of what the technique could be made to produce, and how to work with block cutters.
However, even in eastern Saxony, the Ascanians could establish control only in limited areas, mostly near the River Elbe.
However, upon immunization with SRBC ( sheep red blood cells ), these mice demonstrated a deficiency in the maturation of an antibody response ; they were able to generate normal levels of IgM, but could not develop specific IgG levels.
However, should he decide to testify, he is subject to cross-examination and could be found guilty of perjury.
However, before anything could be done, trouble broke out in northern al-Andalus.
However, Abraham van Calraet could also have used the same initials to denote a painting.
However, GSM base stations could only serve a limited area.
However, Atari started to sue its competitor companies for releasing games to which it had exclusive-rights agreements and Emerson was left with thousands of manufactured games that could no longer be sold.
However, as more people gradually moved from working the land to living in towns ( especially those who could read and write, the only people whose use of language we now know ), the word harvest lost its reference to the time of year and came to refer only to the actual activity of reaping, and autumn, as well as fall, began to replace it as a reference to the season.
However, Conway Morris strongly disagreed with Gould's conclusions, arguing that almost all the Cambrian fauna could be classified into modern day phyla.
However, Marlborough would have to wait until Eugene was in position before the general engagement could begin.
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