Some paleontologists suggest that animals appeared much earlier, possibly as early as 1 billion years ago.

Some paleontologists relate many or most of these forms to modern animals.

Some modern paleontologists still believe that Testudines are the only surviving branch of this ancient evolutionary grade, which includes groups such as procolophonids, millerettids, and pareiasaurs, although that view is not generally accepted.

Some paleontologists believe that it developed independently in monotremes ( or australosphenidans ), rather than being inherited from an ancestor that they share with marsupials and placentals ( or boreosphenidans ); but this idea has critics and the debate is still going on.

Some paleontologists have noted a perceived continuity in skeletal remains.

Some paleontologists have in the past considered the herrerasaurians to be members of Theropoda, while other theorized the group to be basal saurischians, and may even have evolved prior to the saurischian-ornithischian split.

: Some paleontologists consider " living fossils " with large distributions ( such as Triops cancriformis ) not to be real living fossils.

Some 25 species of fossil fishes are often found with stomach contents preserved, enabling paleontologists to study predator-prey relationships in this ecosystem.

Some paleontologists claim that this fossil was removed from the Gobi desert without the permission of the Chinese government and sold without proper documentation.

Some paleontologists speculate that this eruption may have accelerated the extinction of the dinosaurs.

Some paleontologists have doubted the biplane hypothesis, and have proposed other configurations.

Some paleontologists have suggested that feathered dinosaurs used their wings to parachute from trees, possibly to attack or ambush prey on the ground, as a precursor to gliding or true flight.

Some paleontologists were of the opinion that the original specimens were not diagnostic beyond themselves and, therefore, that the name C. bauri could not be applied to any additional specimens.

Some paleontologists used the fifty percent estimate to ascertain the brain size of dinosaur endocasts.

Some paleontologists ( such as Sereno, 2005 < ref name =" sereno2005 ">) have contended that Titanosaurus is too poorly known to use as a basis for classification, family names for which it is the type genus ( e. g. Titanosaurinae, Titanosauridae, Titanosauroidea ) should not have other genera referred to them.

( Some Russian paleontologists ranked it as a superorder instead ).

Some paleontologists have concluded that for part of the year ceratopsids lived in small groups near the coasts and when the dry season came they formed large herds and moved inland.

Some paleontologists have concluded that for part of the year ceratopsids lived in small groups near the coasts and when the dry season came they formed large herds and moved inland.

Some paleontologists, like Paul Sereno, consider the enigmatic alvarezsaurids to be close relatives of the ornithomimosaurs and place them together in the superfamily Ornithomimoidea ( see classification below ).

Some 25 species of fossil fishes are often found with stomach contents preserved, enabling paleontologists to study predator-prey relationships in this ecosystem.

Some paleontologists such as Michael Lee have argued that pareiasaurs include the direct ancestors of modern turtles.

Some paleontologists have speculated that Gasosaurus and Kaijiangosaurus may be one and the same species.

Some paleontologists still place these forms among the " ostracoderms " ( jawless armored " fishes ") of the class Anaspida, but this is increasingly considered an artificial arrangement based on ancestral traits.

Some paleontologists consider the Scelidosauridae paraphyletic, but Benton ( 2004 ) lists the group as monophyletic.

Some painters have less interest in the experience of the moment, with its attendant urgencies and ambiguities, than in looking beyond the flux of particular impressions to a higher, more serene level of truth.

Some of the earlier episodes have touches of the supernatural, as suited to the legendary background.

Some historians have found his point of view not to their taste, others have complained that he makes the Tory tradition appear `` contemptible rather than intelligible '', while a sympathetic critic has remarked that the `` intricate interplay of social dynamics and political activity of which, at times, politicians are the ignorant marionettes is not a field for the exercise of his talents ''.

Some of these thoughts -- not all of them -- have taken organized form in later years.

He said, `` Some have criticized your book as being neither literary criticism nor history.

Some have felt that Washington Irving comes out rather slimly, but let them look at the title of the book ''.

Some of us have imagination and sensibility too.

Some of former President Truman's off-the-cuff discourses have been in that vein.

Some of the stumps are as much as three feet long, but most of them have been flattened by the pressure of the overlying sediments.

Some memorable plays have been drawn from books, notably Life With Father and Diary Of Anne Frank.

Some families already have held weekend rehearsals in their home shelters to learn the problems and to determine for themselves what supplies they would need.

Some special health requirements might have to be met.

Some weapons systems have become obsolescent while still in production, and some while still under development.

Some offices have very broad responsibilities, touching on almost all aspects of a university's instructional program.

Some manufacturers have had the foresight to provide a socket for the chuck key ; ;

Some recreation features, such as scenic values and water interest, also have greater overall value than other interests.

-- Some areas may already have been improved and contain buildings, roads, utilities, cleared land, etcetera which may raise the cost of the site.

Some distribution costs are kept up by competitive pressure, some by the fact that the customers have come to expect certain niceties and flourishes.

Some men have no talent for or interest in management ; ;

Some agents have been shown to be much more toxic or infectious to experimental animals when exposed to aerosols of optimum particle size than by the natural portal.

Some of those who question the value of BW have assumed that the only potential would be in the establishment of epidemics.

Some members of the bee family have become idlers, social parasites that live at the expense of their hardworking relatives.

Some investigators have found a parallelism between remissions and return of the sympathetic reactivity of the hypothalamus to the normal level as indicated by the Mecholyl test and, conversely, between clinical impairment and increasing deviation of this test from the norm.

Some of the oldest, most persistent, and most cohesive forms of social groupings have grown out of religion.