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The central stars of planetary nebulae are very hot . | 4 | 5 |
The bacteria that cause urinary tract infections usually go into the bladder from the uretha . | 5 | 5 |
Not every conjecture can be proven true or false . | 4 | 5 |
Not every conjecture ends up being proven true or false . | 4 | 5 |
Polonium has 33 isotopes , and all of them are radioactive . | 4 | 5 |
Polonium has 42 known isotopes , all of which are radioactive . | 5 | 5 |
The region has steep , glacier - carved mountains , glens and interspersed plains . | 4 | 5 |
Arachnids produce digestive juices in their stomachs , and use their pedipalps and chelicerae to pour them over their dead prey . | 4 | 5 |
A key feature of NMR is that the resonance frequency of a particular simple substance is usually directly proportional to the strength of the applied magnetic field . | 5 | 5 |
It was the mathematical aspect of surveying that led him to exploring the geometrical significance of complex numbers . | 4 | 5 |
Moths , usually their caterpillars , are a major farm pest in many parts of the world . | 4 | 5 |
It is held in many mental health circles that masturbation can relieve depression , stress and lead to a higher sense of self-worth . | 4 | 5 |
The traditional cuisine is famous for an abundance of vegetables and greens used seasonally in the dishes . | 4 | 5 |
A battle between the wilds and pets ensues , with the Pet Paradiso security focused on tranquilizing the wilds . | 4 | 5 |
There was a smallpox epidemic in 1839 that killed a large part of the population of the area . | 4 | 5 |
Some obligate anaerobes use fermentation , while others use anaerobic respiration . | 5 | 5 |
This is judged to be one of the pivotal battles in the control of Indian subcontinent by the colonial powers . | 4 | 5 |
Viral infections in animals provoke an immune response that usually eliminates the infecting virus . | 4 | 5 |
On Earth , most basalt magmas have formed by melting of the mantle . | 4 | 5 |
On Earth , most basalt magmas have formed by decompression melting of the mantle . | 4 | 5 |
The test vehicle , which was used as an atmospheric drop test glider , had no propulsion system . | 5 | 5 |
It is possible for the frenulum of the penis to tear during sexual activity . | 4 | 5 |
It is possible for the frenulum to tear during sexual activities . | 4 | 5 |
Observations of atmospheric chemistry are essential to our understanding . | 4 | 5 |
Many traditional wood joinery techniques use the distinctive material properties of wood , often without resorting to mechanical fasteners or adhesives . | 4 | 5 |
The authority of appellate courts to review the decisions of lower courts varies widely from one jurisdiction to another . | 4 | 5 |
The of appellate courts to review decisions of lower courts varies widely from one jurisdiction to another . | 4 | 5 |
Typically the inner container is immersed about halfway into the working liquid . | 4 | 5 |
The tits are insectivorous , and eat a wide range of small insects and other invertebrates , particularly small leaf-eating caterpillars . | 5 | 5 |
Sometimes certain types of amnesia fix themselves without being treated . | 4 | 5 |
The nautilus shell is one of the finest natural examples of a logarithmic spiral . | 5 | 4 |
The nautilus shell presents one of the finest natural examples of a logarithmic spiral , although it is not a golden spiral . | 5 | 4 |
Humans play a key role in the biosphere , with the large human population dominating many of Earth 's ecosystems . | 4 | 5 |
Much of the classical guitar repertoire is in E minor , as this is a very natural key for the instrument . | 4 | 5 |
A neutral atom has the same number of electrons as protons . | 5 | 4 |
It has often been noted for its complex lightcurves , which made finding its shape and rotation somewhat hard . | 5 | 5 |
The flattened bodies of stingrays allow them to effectively conceal themselves in their environments . | 5 | 4 |
Hedgehogs are nocturnal , but gymnures are less so . | 5 | 4 |
Hedgehogs are nocturnal , but gymnures are less so , and may be active during the day . | 5 | 5 |
Chlorophyll is vital for photosynthesis , which allows plants to absorb energy from light . | 5 | 5 |
Chlorophyll is necessary for photosynthesis , which allows plants to obtain energy from light . | 5 | 5 |
The letter 'h ' is used to represent aspirated consonants . | 4 | 5 |
The letter 'h ' is used to aspirate certain consonants . | 4 | 5 |
No terrestrial globes from Antiquity or the Middle Ages have survived . | 4 | 5 |
In recent times , tropical disturbances that reach tropical storm intensity are named from a predetermined list . | 4 | 5 |
Hawks , like most vertebrates , have four types of color receptors in the eye . | 4 | 5 |
There is little evidence that using preventative antibiotics decreases urinary tract infections in children . | 5 | 4 |
The evidence that preventive antibiotics decrease urinary tract infections in children is poor . | 5 | 5 |
Most coral reefs were formed after the last glacial period when melting ice caused sea level to rise and flood continental shelves . | 4 | 5 |
A flounder 's food is mainly fish spawn , crustaceans , polychaetes and small fish . | 4 | 5 |
No firm dates can be assigned to this Emperor 's life or reign , but he is conventionally considered to have reigned from 507 to 531 . | 4 | 5 |
Herbivores are dependent on plants for food , and have evolved mechanisms to obtain this food despite the evolution of a diverse arsenal of plant defenses . | 4 | 5 |
Herbivores depend on plants for food , and have evolved mechanisms to get this food despite the evolution of many plant defences . | 5 | 4 |
Under some conditions , such as extremely low temperature , some ceramics show superconductivity . | 5 | 4 |
A frequency distribution is said to be skewed when its mean and median are different , or more generally when it is asymmetric , depending on the textbook . | 5 | 5 |
A frequency distribution is said to be skewed when its mean and median are different . | 4 | 5 |
Renewable energy projects in many developing countries have demonstrated that renewable energy can directly contribute to poverty alleviation by providing the energy needed for creating businesses and employment . | 4 | 5 |
There are two objects , one convex and one nonconvex , that can both be called regular icosahedra . | 5 | 5 |
There are two objects , one convex and one concave , that can both be called regular icosahedra . | 5 | 5 |
Metics typically shared the burdens of citizenship without any of its privileges . | 4 | 5 |
There is marked sexual dimorphism in this species . | 4 | 5 |
There is some sexual dimorphism in this species . | 4 | 5 |
Because metals are good conductors of electricity , they are valuable in electrical appliances and for carrying an electric current over long distances with little energy loss or dissipation . | 4 | 5 |
The dorsal and anal fins are divided into anterior spiny and posterior soft-rayed portions , which may be partially or completely separated . | 4 | 5 |
The dorsal and anal fins are divided into front spiny and back soft-rayed portions , which may be partially or completely separated . | 5 | 5 |
In Hydrology , dissipation is the process of converting mechanical energy of downward flowing water into thermal and acoustical energy . | 5 | 5 |
Dissipation is the process of converting mechanical energy of downward - flowing water into thermal and acoustical energy . | 4 | 5 |
The symptoms of strep throat usually improve within three to five days , irrespective of treatment . | 5 | 5 |
Spontaneous abortions occur in various mammals . | 5 | 4 |
In August and September 2011 the statue was vandalized three times , most recently being splashed with red paint . | 4 | 5 |
In some groups , the elytra are fused together , rendering the insect flightless . | 4 | 5 |
The primary application of cheminformatics is in the storage , indexing and search of information relating to compounds . | 4 | 5 |
The primary application of cheminformatics is in the storage of information relating to compounds . | 5 | 5 |
A stream cipher makes use of a much smaller and more convenient cryptographic key , for example 128 bits keys . | 5 | 5 |
Later ornithopods became larger , but never rivaled the incredible size of the long-necked , long-tailed sauropods that they partially supplanted . | 5 | 5 |
Later ornithopods became larger , but never reached the huge size of the long-necked , long-tailed sauropods which they largely replaced . | 4 | 5 |
Praxidike belongs to the Ananke group , believed to be the remnants of a break - up of a captured asteroid . | 5 | 5 |
Praxidike belongs to the Ananke group , believed to be the remnants of a break - up of a captured heliocentric asteroid . | 5 | 5 |
Croup is typically diagnosed based on signs and symptoms . | 4 | 5 |
Cockatoos are recognizable by the prominent crests and curved bills . | 4 | 5 |
Eunomia has been seen occulting stars three times . | 4 | 5 |
Many sans-serif typefaces use plainer oblique designs instead of italic ones . | 4 | 5 |
Many sans serif typefaces use oblique designs instead of italic ones . | 5 | 4 |
Centrioles are typically made up of nine sets of short microtubule triplets , arranged in a cylinder . | 4 | 5 |
Most centrioles are nine sets of microtubule triplets , arranged in a cylinder . | 4 | 5 |
Cenotes are surface connections to subterranean water bodies . | 4 | 5 |
The ability to fly or glide has been suggested for at least five dromaeosaurid species . | 5 | 5 |
The ability to fly or glide has been suggested for at least two dromaeosaur genera . | 4 | 5 |
Wormholes are a common element in science fiction because they allow rapid interstellar , intergalactic , and sometimes even interuniversal travel . | 5 | 5 |
Eucalypts draw a tremendous amount of water from the soil through the process of transpiration . | 4 | 5 |
Mycobacterial infections are notoriously difficult to treat . | 4 | 5 |
Mycobacterial infections are difficult to treat . | 4 | 5 |
Unaipon took out provisional patents for 19 inventions but was unable to afford to get any of his inventions fully patented , according to some sources . | 4 | 5 |
Unaipon took out provisional patents for 19 inventions , but he could not afford to get any of his inventions fully patented . | 5 | 5 |
Limited omnibus editions collect roughly 24 issues in a slipcase with several extras . | 4 | 5 |
A volcanologist is a geologist who studies the eruptive activity and formation of volcanoes , and their current and historic eruptions . | 5 | 4 |
The metabolic system of a particular organism determines which substances it will find nutritious and which poisonous . | 5 | 5 |
The metabolic system of an organism decides which substances it finds nutritious and which poisonous . | 4 | 5 |
The party favors the civil right to information privacy and reforms of copyright , education , genetic patents and drug policy . | 4 | 5 |
Subfamily Nymphicinae Subfamily Calyptorhynchinae : The black cockatoos Subfamily Cacatuinae | 5 | 5 |