Question: Nonvascular land plants are embryophytes that lack the vascular tissues xylem and phloem. They include mosses, liverworts and hornworts. Pteridophytic vascular plants with true xylem and phloem that reproduced by spores germinating into free-living gametophytes evolved during the Silurian period and diversified into several lineages during the late Silurian and early Devonian. Representatives of the lycopods have survived to the present day. By the end of the Devonian period, several groups, including the lycopods, sphenophylls and progymnosperms, had independently evolved "megaspory" – their spores were of two distinct sizes, larger megaspores and smaller microspores. Their reduced gametophytes developed from megaspores retained within the spore-producing organs (megasporangia) of the sporophyte, a condition known as endospory. Seeds consist of an endosporic megasporangium surrounded by one or two sheathing layers (integuments). The young sporophyte develops within the seed, which on germination splits to release it. The earliest known seed plants date from the latest Devonian Famennian stage. Following the evolution of the seed habit, seed plants diversified, giving rise to a number of now-extinct groups, including seed ferns, as well as the modern gymnosperms and angiosperms. Gymnosperms produce "naked seeds" not fully enclosed in an ovary; modern representatives include conifers, cycads, Ginkgo, and Gnetales. Angiosperms produce seeds enclosed in a structure such as a carpel or an ovary. Ongoing research on the molecular phylogenetics of living plants appears to show that the angiosperms are a sister clade to the gymnosperms.
Is there an answer to this question: What is the term for plants whose seeds do not have a protective ovary?

Answer: Gymnosperms


Question: The Theater District is a 17-block area in the center of downtown Houston that is home to the Bayou Place entertainment complex, restaurants, movies, plazas, and parks. Bayou Place is a large multilevel building containing full-service restaurants, bars, live music, billiards, and Sundance Cinema. The Bayou Music Center stages live concerts, stage plays, and stand-up comedy. Space Center Houston is the official visitors' center of NASA's Lyndon B. Johnson Space Center. The Space Center has many interactive exhibits including moon rocks, a shuttle simulator, and presentations about the history of NASA's manned space flight program. Other tourist attractions include the Galleria (Texas's largest shopping mall, located in the Uptown District), Old Market Square, the Downtown Aquarium, and Sam Houston Race Park.
Is there an answer to this question: How much area of downtown Houston does the Theater District cover?

Answer: 17-block area


Question: Miami's heavy-rail rapid transit system, Metrorail, is an elevated system comprising two lines and 23 stations on a 24.4-mile (39.3 km)-long line. Metrorail connects the urban western suburbs of Hialeah, Medley, and inner-city Miami with suburban The Roads, Coconut Grove, Coral Gables, South Miami and urban Kendall via the central business districts of Miami International Airport, the Civic Center, and Downtown. A free, elevated people mover, Metromover, operates 21 stations on three different lines in greater Downtown Miami, with a station at roughly every two blocks of Downtown and Brickell. Several expansion projects are being funded by a transit development sales tax surcharge throughout Miami-Dade County.
Is there an answer to this question: How many lines does Metromover have?

Answer: three


Question: Peruvian Carnival incorporates elements of violence and reflects the urban violence in Peruvian society following the internal conflict in Peru. Traditionally, Peruvian Andean festivities were held on this period every year because it is the rainy season. It was already violent during the 19th century, but the government limited the practice. During the early 20th century it consisted partying and parading, while in the second half of the 20th century it acquired violent characteristics that continued. It was banned, first from the streets in 1958 and altogether in 1959 by the Prado government. It consisted basically of water battles in a traditional way,[clarification needed] while in later years it included playing with dirty water, mud, oil and colorants -and also including fighting and sometimes looting private property and sexual assaults on women. It has become an excuse for criminal gangs to rob people while pretending to celebrate. As of 2010, it had become so violent that the government imposed penalties of up to eight years in prison for violence during the games (the games themselves are not forbidden, but using violence during the games or coercing others to participate is).
Is there an answer to this question: When did the festivities acquire their violent tendencies?

Answer:
second half of the 20th century