Sentences with phrase «as vertebrates»

First - time visitors may want to begin with the Popular Pages section that offers links to the most popular groups on the tree of life, such as the vertebrates, insects, arachnids, and green plants.

Also, as vertebrates, zebrafish have many body parts in common with humans, and their development can easily be compared to human development.

If the conodonts are classified as vertebrates, it suggests that vertebrate skeletons evolved not from the protective scales of fish, but from teeth.

As vertebrates evolved, the entire genome was duplicated not once but twice.

The term macroevolution, by contrast, refers to the origin of new species and divisions of the taxonomic hierarchy above the species level, and also to the origin of complex adaptations, such as the vertebrate eye.

This is typical Rothschild: considering the bends not as a human ailment, first documented by a miner in 1841, but as a vertebrate's disease, one that can be tracked backward through more than 200 million years of mammalian evolution.

They also claimed it contained other internal organ structures, such as gill sacs, that identified it as a vertebrate, and that the animal's teeth resembled those of lamprey.

In a new report in the journal Palaeontology, Sallan and colleagues argue that the two papers that seemingly settled the Tully monster debate are flawed, failing to definitively classify it as a vertebrate.

As far as the vertebrate / mollusk eye is concerned, intermediate, functioning stages have existed in nature, which is also an illustration of the many varieties and peculiarities of eye construction.

The zebrafish is a good choice because of its similarity to humans as a vertebrate, its transparency as an embryo, and the powerful genetic tools available in this model organism.

As a vertebrate paleontologist, he studies the fossils of animals with backbones.

In a paper published in 1987, he and his colleagues went on to unravel the details of a core network of interacting interneurons in the lamprey as a vertebrate model system.

Not exact matches

Parthenogenesis occurs naturally in many plants, some invertebrate animal species (including nematodes, water fleas, some scorpions, aphids, some bees, some Phasmida and parasitic wasps) and a few vertebrates (such as some fish, amphibians, reptiles and very rarely birds.

@transframer — With all due respect, you didn't really address the issues raised regarding: 1) actual # of extant vertebrate species; 2) the fact that land inverts «breath air» and would have drowned if not accounted for on the ark; 3) that the dino genera identified in the wiki link far exceeds 50; 4) the need to account for extinct land vertebrates in addition to those still around; 5) that many marine fish would have died as their habitat's salinity dropped; 6) that your % allotments for food / water don't reflect the fact that many forms require fresh meat and / or eat disproportionately to their sizes; 7) the specific dietary / environmental constraints involved in the migration to the Ark and the return trips from Mt. Ararat.

If God is taken to be like that, it then follows that human love itself is interpreted as being «Pollyanna - ish» sentimentality, prepared to accept whatever happens, tolerant of anything, however vicious, and utterly lacking in vertebrate strength.

There is no such «direct» evolution: animals, bacteria, and algae have a common ancestor from which they have diverged, as can be shown by aligning and comparing amino acid sequences of proteins and nucleotide sequences of homologous ribosomal RNA molecules that are found in both bacteria and vertebrates.

Furthermore, sensory receptors for these chemicals have been found in all vertebrates except cartilaginous fishes such as sharks.

We can follow it in insects as in vertebrates; and among the vertebrates we can follow it from class to class, from order to order, and from family to family.

The final count was 384 species of birds, 21 species of mammals, and a nice selection of other vertebrates, as well as many interesting plants and invertebrates.

Saniwa ensidens is the only known jawed vertebrate to have had two eyelike photosensory structures at the top of the head, in addition to the organs we commonly think of as eyes, researchers report April 2 in Current Biology.

One previous study of a single footprint of a large tyrannosaur suggests that the beast could have been traveling as fast as 11 kilometers per hour (6.8 miles per hour), says Eric Snively, a vertebrate paleontologist at the University of Wisconsin, La Crosse.

In most vertebrates and some mollusks, the eye works by allowing light to enter it and project onto a light - sensitive panel of cells known as the retina at the rear of the eye, where the light is detected and converted into electrical signals.

«The broad picture,» Yau says, «is that the local pupillary light reflex appeared early in primitive vertebrates such as jawless fish, even before the brain got involved.

Are we vertebrate humans ever going to be able to build anything as deformable and complex as a real octopus?

Planetary cues, such as magnetic inclination and moon phase, guide northern elephant seals and other large vertebrates over long distances and across time.

«Re-examination of old fossils using new techniques is just as important for revitalizing our understanding of vertebrate evolution.»

Yet in waters from the Sea of Japan (aka East Sea) to the Black Sea, jellies today are thriving as many of their marine vertebrate and invertebrate competitors are eliminated by overfishing, dead zones and other human impacts.

There is only one group of vertebrate that has the capacity to regenerate highly complex structures such as limbs, jaws, tail, spinal cord, or eyes throughout their lives: the urodele amphibians.

This is true not just for humans and other vertebrates but for squids and other cephalopods as well.

«The work not only provides insight into how turtles evolved, but also gives hints as to how the vertebrate developmental programs can be changed to produce major evolutionary novelties.»

Over the last few decades, scientists have observed cannibalism — defined by Schutt as eating all or part of another individual of the same species — among all major groups of vertebrates.

But when nature settles on the same solution to a difficult problem more than once, as it did with vertebrates and cephalopods, it is worth paying attention.

David Hone at the Institute of Vertebrate Palaeontology and Palaeoanthropology in Beijing, China, and Mahito Watabe of the Hayashibara Museum of Natural Sciences in Okayama, Japan, report that tooth marks on the 70 - million - year - old bone match the pattern and shape of the teeth of Tarbosaurus, an Asian tyrannosaur nearly as big as T. rex (Acta Palaeontologica Polonica, DOI: 10.4202 / app.2009.0133).

This evidence was crucial because only vertebrates have two different shapes of melanosome, meaning that unlike previous researchers that thought that Tullimonstrum was an invertebrate (animal without a backbone), this is the first unequivocal evidence that Tullimonstrum is a member of the same group of animals as us, the vertebrates.»

Genetic studies show that mollusk ancestors split from the vertebrates around 1.2 billion years ago, making humans at least as closely related to shrimps, starfish, and earthworms as to octopuses.

As a result, the brown tree frog is the only known southern vertebrate that can survive being frozen.

Insects, he says, also need less food and space than vertebrate sources of protein and therefore could replace or supplement food resources that may become scarce in the future, such as fish stocks, which a recent study indicates may collapse by 2048.

«Wolves rely on large prey to survive,» said Benson, assistant professor of vertebrate ecology who conducted the research as a doctoral student at Trent University.

Hornworm moth larvae respond aggressively when pecked by vertebrate predators such as birds, but it wasn't clear whether they reacted toward invertebrate predators in a similar fashion — and whether invertebrates, too, could have played a role in the evolution of caterpillar defenses.

This is the rock band's second major contribution to science; as you'll recall, the band revolutionized vertebrate biomechanics in 1983 with their discovery that women possess legs and know how to use them.»)

In recent years, Xenoturbella has been regarded as either close to vertebrates and echinoderms, or as a more distant relative on its own branch further away.

This gallery highlights some of their discoveries, and shows what it takes for scientists to operate in one of the least hospitable places on Earth, which, as it turns out, played a key role in the evolution and migration of the planet's vertebrates, including mammals.

Pyenson et al. report that the site, Cerro Ballena, dates to the Late Miocene period and consists of over 40 skeletons of marine vertebrates, including rorqual and sperm whales, seals, predatory fishes, and fascinating, now completely extinct, species such as walrus - whales and aquatic sloths.

Necessity Is the Mother of Invention: SciJobs.org As a graduate student, Plautz used cellular and molecular biology techniques to examine the interactions that lead to lens and eye formation in vertebrates such as frogAs a graduate student, Plautz used cellular and molecular biology techniques to examine the interactions that lead to lens and eye formation in vertebrates such as frogas frogs.

Marine vertebrates at every depth are being affected, as are humans.

One means of accomplishing that would be to include lab chiefs» safety records among the materials submitted in grant proposals (and weighed in funding decisions), alongside currently required materials such as human subjects and vertebrate - care documentation.

The threatened species include at least 9 % of bees and butterflies and about 16 % of vertebrate pollinators such as bats and hummingbirds.

Horner and his experienced colleagues — a structural geologist; a stratigrapher; a taphonomist (one who studies what happens to animals after they die); paleontologists specializing in vertebrate, mammalian, plant, and mollusk fossils; a molecular paleontologist; and an expert on paleomagnetism — are surveying all the fauna and flora that existed during the Hell Creek period (and that survived as fossils), the ways they interacted, and how they may have evolved.

Once thought rare in humans and other vertebrates, RNA editing is now recognized as widespread in the human genome.

A spider that feeds indirectly on vertebrate blood by choosing female mosquitoes as prey.