Context and question: An antenna (plural antennae or antennas), or aerial, is an electrical device which converts electric power into radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver. In transmission, a radio transmitter supplies an electric current oscillating at radio frequency (i.e. a high frequency alternating current (AC)) to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic waves (radio waves). In reception, an antenna intercepts some of the power of an electromagnetic wave in order to produce a tiny voltage at its terminals, that is applied to a receiver to be amplified.
What device is often used in conjuntion with the antenna?
Answer: radio transmitter or radio receiver
Context and question: The sovereign territory of Israel (according to the demarcation lines of the 1949 Armistice Agreements and excluding all territories captured by Israel during the 1967 Six-Day War) is approximately 20,770 square kilometers (8,019 sq mi) in area, of which two percent is water. However Israel is so narrow that the exclusive economic zone in the Mediterranean is double the land area of the country. The total area under Israeli law, including East Jerusalem and the Golan Heights, is 22,072 square kilometers (8,522 sq mi), and the total area under Israeli control, including the military-controlled and partially Palestinian-governed territory of the West Bank, is 27,799 square kilometers (10,733 sq mi). Despite its small size, Israel is home to a variety of geographic features, from the Negev desert in the south to the inland fertile Jezreel Valley, mountain ranges of the Galilee, Carmel and toward the Golan in the north. The Israeli Coastal Plain on the shores of the Mediterranean is home to 57 percent of the nation's population. East of the central highlands lies the Jordan Rift Valley, which forms a small part of the 6,500-kilometer (4,039 mi) Great Rift Valley.
How big is the sovereign territory of Israel?
Answer: 20,770 square kilometers
Context and question: The climate of the Cretaceous is less certain and more widely disputed. Higher levels of carbon dioxide in the atmosphere are thought to have caused the world temperature gradient from north to south to become almost flat: temperatures were about the same across the planet. Average temperatures were also higher than today by about 10C. In fact, by the middle Cretaceous, equatorial ocean waters (perhaps as warm as 20 C in the deep ocean) may have been too warm for sea life,[dubious discuss][citation needed] and land areas near the equator may have been deserts despite their proximity to water. The circulation of oxygen to the deep ocean may also have been disrupted.[dubious discuss] For this reason, large volumes of organic matter that was unable to decompose accumulated, eventually being deposited as "black shale".
Lower levels of carbon dioxide caused what?
Answer:
unanswerable