input question: The answer to the question: Who had prevously worked wiht Thirty Seconds to Mars on the production of This is War? is inside the article: "City of Angels" was written by lead vocalist Jared Leto, who also produced the song with Steve Lillywhite. The latter had previously worked with Thirty Seconds to Mars on the production of the band's third studio album, This Is War (2009). The song was engineered by Jamie Reed Schefman and mixed by Serban Ghenea. John Hanes engineered it for mixing at Mixstar Studios in Virginia Beach, Virginia. It was recorded at The International Centre for the Advancement of the Arts and Sciences of Sound in Los Angeles, California and mastered by Howie Weinberg and Dan Gerbarg at Howie Weinberg Mastering. Thirty Seconds to Mars unveiled six songs from their fourth studio album Love, Lust, Faith and Dreams, including "City of Angels", during a preview held at the Electric Lady Studios in New York City on March 14, 2013. Shannon Leto revealed that it was the oldest song written for the album and took a long time to make.While writing the song, Leto was influenced by the culture of Los Angeles and inspired by his relationship with it. He explained that pursuing his creative ambitions in Los Angeles had led to a "love/hate relationship" with the city. Leto told Interview magazine, "the song is about people coming to the City of Angels to live their dreams and to make their dreams their reality. It's about how the other people they've met in the city have helped them—you know, a group of people all kind of joining together into a community of outsiders, of mavericks, of freaks, of artists. It's about coming to a place to do something different and something special.", can you guess it ????
output answer: Steve Lillywhite

input question: The answer to the question: What caused the Cretaceous–Paleogene extinction event? is inside the article: The Chicxulub crater (; Mayan: [tʃʼikʃuluɓ]) is an impact crater buried underneath the Yucatán Peninsula in Mexico. Its center is located near the town of Chicxulub, after which the crater is named. It was formed by a large asteroid or comet about 11 to 81 kilometres (6.8 to 50.3 miles) in diameter, the Chicxulub impactor, striking the Earth. The date of the impact coincides precisely with the Cretaceous–Paleogene boundary (K–Pg boundary), slightly less than 66 million years ago, and a widely accepted theory is that worldwide climate disruption from the event was the cause of the Cretaceous–Paleogene extinction event, a mass extinction in which 75% of plant and animal species on Earth became extinct, including all non-avian dinosaurs. The crater is estimated to be 150 kilometres (93 miles) in diameter and 20 km (12 mi) in depth, well into the continental crust of the region of about 10–30 km (6.2–18.6 mi) depth. It is the second largest confirmed impact structure on Earth and the only one whose peak ring is intact and directly accessible for scientific research.The crater was discovered by Antonio Camargo and Glen Penfield, geophysicists who had been looking for petroleum in the Yucatán during the late 1970s. Penfield was initially unable to obtain evidence that the geological feature was a crater and gave up his search. Later, through contact with Alan Hildebrand in 1990, Penfield obtained samples that suggested it was an impact feature. Evidence for the impact origin of the crater includes shocked quartz, a gravity anomaly, and tektites in surrounding areas. In 2016, a scientific drilling project drilled deep into the peak ring of the impact crater, hundreds of meters below the current sea floor, to obtain rock core samples from the impact itself. The discoveries were widely seen as confirming current theories related to both the crater impact and its effects., can you guess it ????
output answer: comet

input question: The answer to the question: How many acres is the larger ecosystem that park located in the northwestern region is a part of? is inside the article: Grand Teton National Park is located in the northwestern region of the U.S. state of Wyoming. To the north the park is bordered by the John D. Rockefeller, Jr. Memorial Parkway, which is administered by Grand Teton National Park. The scenic highway with the same name passes from the southern boundary of Grand Teton National Park to West Thumb in Yellowstone National Park. Grand Teton National Park covers approximately 310,000 acres (130,000 ha), while the John D. Rockefeller, Jr. Memorial Parkway includes 23,700 acres (9,600 ha).  Most of the Jackson Hole valley and virtually all the major mountain peaks of the Teton Range are within the park. The Jedediah Smith Wilderness of Caribou-Targhee National Forest lies along the western boundary and includes the western slopes of the Teton Range. To the northeast and east lie the Teton Wilderness and Gros Ventre Wilderness of Bridger-Teton National Forest. The National Elk Refuge is to the southeast, and migrating herds of elk winter there. Privately owned land borders the park to the south and southwest. Grand Teton National Park, along with Yellowstone National Park, surrounding National Forests and related protected areas constitute the 18,000,000-acre (7,300,000 ha) (28,000 sq mi (73,000 km2)) Greater Yellowstone Ecosystem. The Greater Yellowstone Ecosystem spans across portions of three states and is one of the largest intact mid-latitude ecosystems remaining on Earth. By road, Grand Teton National Park is 290 mi (470 km) from Salt Lake City, Utah and 550 mi (890 km) from Denver, Colorado., can you guess it ????
output answer:
18,000,000