Its life history is much simpler than that of the truly colonial bumblebees and can serve as an example of the life cycle of many other species.

In the adult state they have tear ducts and movable eyelids and most species have ears that can detect airborne or ground vibrations.

They have a muscular tongue which in many species can be protruded.

In air, where oxygen is more concentrated, some small species can rely solely on cutaneous gas exchange, most famously the plethodontid salamanders, which have neither lungs nor gills.

Note that the acid can be the charged species and the conjugate base can be neutral in which case the generalized reaction scheme could be written as HA < sup >+</ sup > H < sup >+</ sup > + A.

One seed-to-seed life cycle for an annual can occur in as little as a month in some species, though most last several months.

Thus although most species in the order are herbaceous, some no more than 15 cm high, there are a number of climbers ( e. g. some species of Asparagus ), as well as several genera forming trees ( e. g. Agave, Cordyline, Yucca, Dracaena ), some of which can exceed 10 m in height.

A more or less typical monocotyledon, the species can be recognized by its shortly branched inflorescence covered with branched hairs ( giving rise to the common name of Lamb's-tail ).

Loyalty requires affection also to the office of the Sovereign, attachment to royalty, attachment to the law and to the constitution of the realm, and he who would, by force or by fraud, endeavour to prostrate that law and constitution, though he may retain his affection for its head, can boast but an imperfect and spurious species of loyalty ( R v O ' Connell ( 1844 ) 7 ILR 261 ).

Flowers across the Apiaceae are fairly uniform and are usually perfect ( hermaphroditic ) and actinomorphic, but some are andromonoecious, polygamomonoecious, or even dioecious ( as in Acronema ), with a distinct calyx and corolla, but the calyx if often highly reduced, to the point of being undetectable in many species, while the corolla can be white, yellow, pink or purple.

A relation can be both symmetric and antisymmetric ( e. g., the equality relation ), and there are relations which are neither symmetric nor antisymmetric ( e. g., the " preys on " relation on biological species ).

A few species of hummingbirds, notably some hillstars, can be seen at altitudes above, but far higher diversities can be found at lower altitudes, especially in the humid Andean forests (" cloud forests ") growing on slopes in Colombia, Ecuador, Peru, Bolivia and far northwestern Argentina.

The composition of resins is highly variable ; each species produces a unique blend of chemicals which can be identified by the use of pyrolysis – gas chromatography – mass spectrometry.

The true alligators are today represented to two species, A. mississippiensis in the southeastern United States, which can grow to 4. 24 m ( 14 ft ) and weigh 1000 lbs ( 454. 5 kg ) and the small A. sinensis in the Yangtze River, People's Republic of China, which grows to an average of 1. 5 m ( 5 ft ).

As befits its weedy life history, amaranth grains grow very rapidly and their large seedheads can weigh up to 1 kilogram and contain a half-million seeds in three species of amaranth.

It has the capacity to get to large heights and can outcompete native plant species around it.

Perfumes can still be found with ambergris around the world, it is collected from remains found at sea and on beaches, although its precursor originates from the sperm whale, which is a vulnerable species.

Antibacterials can also affect the vaginal flora, and may lead to overgrowth of yeast species of the genus Candida in the vulvo-vaginal area.

For instance, antibacterial resistance genes can be exchanged between different bacterial strains or species via plasmids that carry these resistance genes.

Starting with a recent single ancestor, this process results in the speciation and phenotypic adaptation of an array of species exhibiting different morphological and physiological traits with which they can exploit a range of divergent environments.

Adaptive radiation, a characteristic example of cladogenesis, can be graphically illustrated as a " bush ", or clade, of coexisting species ( on the tree of life ).

The eyed and eyeless forms of A. mexicanus, being members of the same species, are closely related and can interbreed.

And find in the answer a license to be a variant of the human species.

It seems to me that the first human being to reach one of these planets may well learn what it is to be a truly great and noble species ''.

There must be several dozen species in the United States alone.

Finally, it is suggested that in many respects the horse lung may be anatomically more comparable to that of the human than any other presently known species.

The forelimbs may be partially developed and the hind limbs are rudimentary in pond-living species but may be rather more developed in species that reproduce in moving water.

The presence of a particular species in an area may be more easily discerned by its characteristic call than by a fleeting glimpse of the animal itself.

In 2006 there were believed to be 4, 035 species of amphibians that depended on water at some stage during their life cycle.

Of these, 1, 356 ( 33. 6 %) were considered to be threatened and this figure is likely to be an underestimate because it excludes 1, 427 species for which there was insufficient data to assess their status.

A number of causes are believed to be involved, including habitat destruction and modification, over-exploitation, pollution, introduced species, climate change, endocrine-disrupting pollutants, destruction of the ozone layer ( ultraviolet radiation has shown to be especially damaging to the skin, eyes, and eggs of amphibians ), and diseases like chytridiomycosis.

A number of species have come to be considered invasive, including, most notably in North America, dandelion, which was originally introduced by European settlers who used the young leaves as a salad green.

( If the condition is thought to be cellulitis rather than abscess, consideration should be given to possibility of strep species as cause that are still sensitive to traditional anti-staphylococcus agents such as dicloxacillin or cephalexin in patients able to tolerate penicillin ).

These snails cling solidly with their broad muscular foot to rocky surfaces at sublittoral depths, although some species such as Haliotis cracherodii used to be common in the intertidal zone.

These reactions can be distinguished by the type of substituting species into a nucleophilic, electrophilic or radical substitution.

Cnidarians are distinguished from all other animals by having cnidocytes that fire like harpoons and are used mainly to capture prey but also as anchors in some species.

These species can be distinguished from the cane toad by the absence of large parotoid glands behind their eyes and the lack of a ridge between the nostril and the eye.

Juvenile cane toads may be confused with species of the Uperoleia genus, but their adult colleagues can be distinguished by the lack of bright colouring on the groin and thighs.

As well, von Baer early noted that embryos of different species could not be easily distinguished from one another as in adults.

Easily distinguished from most other endemic salamander species simply by their size — hellbenders average up to sixty centimeters or about two feet in length — the only species that requires further distinction ( due to an overlap in distribution and size range ) is the mudpuppy ( Necturus maculosus ).

It may also be distinguished from other kumquats by its round leaves that make this species unique within the genus.

The four forms commonly distinguished by the inhabitants of South America are recognized as distinct species, though with difficulties in defining their distinctive characteristics.

These stories feature Virginia gentleman John Carter mysteriously transported to a Mars ( called Barsoom by the natives ) distinguished by humanoid princesses, fierce warriors of several species, exotic animals, and mixtures of antique with advanced technology.

In addition, malts are distinguished by the two major species of barley used for malting, two-row and six-row.

Other small-fruited pears, distinguished by their early ripening and apple-like fruit, may be referred to as P. cordata, a species found wild in western France and southwestern England.

Due to the subtle variations between specimens of pteranodontid from the Niobrara Formation, most researchers have assigned all of them to the single genus Pteranodon, in at least two species ( P. longiceps and P. sternbergi ) distinguished mainly by the shape of the crest.

Vänern has five distinguished species of whitefish:

In present-day use, the term refers to lawful hunting, as distinguished from poaching, which is the killing, trapping or capture of the hunted species contrary to applicable law.

These species can be distinguished from P. vera by their geographic distributions ( in the wild ) and their nuts.

Mastocarpus stellatus ( Stackhouse ) Guiry is a similar species which can be readily distinguished by its strongly channelled and often somewhat twisted thallus.

One of two living species of whale in the Monodontidae family, along with the beluga whale, narwhal males are distinguished by a long, straight, helical tusk, actually an elongated upper left canine.

In the first attempt to understand the many species, Lull found two groups, although he did not say how he distinguished them: one composed of T. horridus, T. prorsus, and T. brevicornus ; the other of T. elatus and T. calicornis.

The following species are considered nomina dubia (" dubious names "), and are based on remains that are too poor or incomplete to be distinguished from pre-existing Triceratops species.

However, in some countries these two terms are distinguished: the subject of a habitat is a species or a population, the subject of a biotope is a biological community.

The different species of honey bees are distinguished from all other bee species ( and virtually all other Hymenoptera ) by the possession of small barbs on the sting, but these barbs are found only in the worker bees.

The blight-resistant Chinese Chestnut is now the most commonly planted chestnut species in the U. S. It can be distinguished from the American chestnut by its hairy twig tips which are in contrast to the hairless twigs of the American chestnut.