Q: Information:  - Africa is the world's second-largest and second-most-populous continent. At about 30.3 million km² (11.7 million square miles) including adjacent islands, it covers 6% of Earth's total surface area and 20.4 % of its total land area. With 1.1 billion people as of 2013, it accounts for about 15% of the world's human population. The continent is surrounded by the Mediterranean Sea to the north, both the Suez Canal and the Red Sea along the Sinai Peninsula to the northeast, the Indian Ocean to the southeast, and the Atlantic Ocean to the west. The continent includes Madagascar and various archipelagos. It contains 54 fully recognized sovereign states (countries), nine territories and two "de facto" independent states with limited or no recognition.  - An antelope is a member of a number of even-toed ungulate species indigenous to various regions in Africa and Eurasia. Antelopes comprise a wastebasket taxon (miscellaneous group) within the family Bovidae, encompassing those Old World species that are not cattle, sheep, buffalo, bison, or goats. A group of antelope is called a herd.  - The African buffalo or Cape buffalo ("Syncerus caffer") is a large African bovine. It is not closely related to the slightly larger wild water buffalo of Asia and its ancestry remains unclear. "Syncerus caffer caffer", the Cape buffalo, is the typical subspecies, and the largest one, found in South and East Africa. "S. c. nanus" (African forest buffalo) is the smallest subspecies, common in forest areas of Central and West Africa, while "S. c. brachyceros" is in West Africa and "S. c. aequinoctialis" is in the savannas of Central Africa. The adult buffalo's horns are its characteristic feature; they have fused bases, forming a continuous bone shield across the top of the head referred to as a "boss". They are widely regarded as very dangerous animals, as they gore and kill over 200 people every year.  - African forest buffalo ("Syncerus caffer nanus"), known also as the Congo buffalo, is the smallest subspecies of the African buffalo. It is related to the Cape buffalo ("Syncerus caffer caffer"), West African savanna buffalo ("Syncerus caffer brachyceros") and Central African savanna buffalo ("Syncerus caffer aequinoctialis"). However, it is the only subspecies that occurs mainly in the rainforest of central and western Africa with an annual rainfall around 1,500 mm.  - The biological subfamily Bovinae includes a diverse group of 10 genera of medium to large - sized ungulates , including domestic cattle , bison , African buffalo , the water buffalo , the yak , and the four - horned and spiral - horned antelopes . The evolutionary relationship between the members of the group is obscure , and their classification into loose tribes rather than formal subgroups reflects this uncertainty . General characteristics include cloven hoofs and usually at least one of the sexes of a species having true horns . The largest extant bovine is the gaur . In most countries , bovids are used for food . Cattle are eaten almost everywhere , but in parts of India and Nepal they are considered sacred by most Hindus .  - Bison are large, even-toed ungulates in the genus "Bison" within the subfamily Bovinae.  - The water buffalo or domestic Asian water buffalo ("Bubalus bubalis") is a large bovid originating in South Asia, Southeast Asia, and China. Today, it is also found in Europe, Australia, South America and some African countries. The wild water buffalo ("Bubalus arnee") native to Southeast Asia is considered a different species, but most likely represents the ancestor of the domestic water buffalo.  - The even-toed ungulates (order Artiodactyla) are ungulates (hoofed animals) whose weight is borne equally by the third and fourth toes. By contrast, odd-toed ungulates, such as horses, bear their weight primarily on their third toe. The aquatic Cetaceans (whales, dolphins, and porpoises) evolved from even-toed ungulate ancestors, and therefore modern taxonomic classification combines Artiodactyla and Cetacea into Cetartiodactyla.    What is the relationship between 'bovinae' and 'bovidae'?
A: parent taxon

Q: Information:  - A BMX bike is an off-road sport bicycle used for racing and stunt riding. BMX means bicycle motocross.  - Raymon van der Biezen ( born January 14 , 1987 in Heesch ) is a Dutch BMX racer . Van der Biezen reached the semi final of the 2008 World Championship in Taiyuan , China . He qualified himself for the 2008 Summer Olympics in Beijing .  - BMX racing is a type of off-road bicycle racing. The format of BMX was derived from motocross racing. BMX bicycle races are sprint races on purpose-built off-road single-lap race tracks. The track usually consists of a starting gate for up to eight racers, a groomed, serpentine, dirt race course made of various jumps and rollers and a finish line. The course is usually flat, about wide and has large banked corners that help the riders maintain speed.  The sport of BMX racing is facilitated by a number of regional and international sanctioning bodies. They provide rules for sanctioning the conduct of the flying, specify age group and skill-level classifications among the racers, and maintain some kind of points-accumulation system over the racing season. The sport is very family oriented and largely participant-driven, with riders ranging in age from 2 to 70, and over. Professional ranks exist for both men and women, where the age ranges from 18 to 40 years old.  - Motocross is a form of off-road motorcycle racing held on enclosed off-road circuits. The sport evolved from motorcycle trials competitions held in the United Kingdom.  - BMX, an abbreviation for bicycle motocross, is a cycle sport performed on BMX bikes, either in competitive BMX racing or freestyle BMX, or else in general on- or off-road recreation. BMX began when young cyclists appropriated motocross tracks for fun, racing and stunts, eventually evolving specialized BMX bikes and competitions.  - Freestyle BMX is bicycle motocross stunt riding on BMX bikes. It is an extreme sport descended from BMX racing that consists of five disciplines: street, park, vert, trails, and flatland.  - Cycle sport is competitive physical activity using bicycles. There are several categories of bicycle racing including road bicycle racing, time trialling, cyclo-cross, mountain bike racing, track cycling, BMX, and cycle speedway. Non-racing cycling sports include artistic cycling, cycle polo, freestyle BMX and mountain bike trials. The Union Cycliste Internationale (UCI) is the world governing body for cycling and international competitive cycling events. The International Human Powered Vehicle Association is the governing body for human-powered vehicles that imposes far fewer restrictions on their design than does the UCI. The UltraMarathon Cycling Association is the governing body for many ultra-distance cycling races.    What is the relationship between 'raymon van der biezen' and 'bicycle motocross'?
A:
sport