Problem: When land is cleared, habitats are lost. It may be cleared for agriculture. It may also be used for building new homes or businesses. Within the past 100 years, the amount of land used for agriculture has almost doubled. Land used for grazing cattle has more than doubled. Many wetlands have also been lost to agriculture. The U.S. has lost almost all the natural tall-grass prairies. Thee areas of tall thick grass have virtually disappeared. These areas of land had thick fertile soil. Their grasses had very deep root systems. These deep and thick roots reduced the amount of soil erosion. They also were home to many plants and animals. Prairies were wonderful places. They were home to colorful flowers, prairie dogs, and herds of bison.

Question: "Why may land be cleared?"

Answer: "Land may be cleared for agriculture, or used for building new homes or businesses"
Answer: yes

Problem: Even though electronic espionage may cost U.S. firms billions of dollars a year, most aren't yet taking precautions, the experts said. By contrast, European firms will spend $150 million this year on electronic security, and are expected to spend $1 billion by 1992. Already many foreign firms, especially banks, have their own cryptographers, conference speakers reported. Still, encrypting corporate communications is only a partial remedy. One expert, whose job is so politically sensitive that he spoke on condition that he wouldn't be named or quoted, said the expected influx of East European refugees over the next few years will greatly increase the chances of computer-maintenance workers, for example, doubling as foreign spies. Moreover, he said, technology now exists for stealing corporate secrets after they've been "erased" from a computer's memory. He said that Oliver North of Iran-Contra notoriety thought he had erased his computer but that the information was later retrieved for congressional committees to read. No personal computer, not even the one on a chief executive's desk, is safe, this speaker noted. W. Mark Goode, president of Micronyx Inc., a Richardson, Texas, firm that makes computer-security products, provided a new definition for Mikhail Gorbachev's campaign for greater openness, known commonly as glasnost. Under Mr. Gorbachev, Mr. Goode said, the Soviets are openly stealing Western corporate communications. He cited the case of a Swiss oil trader who recently put out bids via telex for an oil tanker to pick up a cargo of crude in the Middle East. Among the responses the Swiss trader got was one from the Soviet national shipping company, which hadn't been invited to submit a bid. The Soviets' eavesdropping paid off, however, because they got the contract.

Question: "What is the full name of the man who claimed that the Soviets are openly stealing Western corporate communications?"

Answer: "Oliver North"
Answer: no

Problem: Fossils may form in other ways. Fossils can be preserved almost completely. In this process, the organism doesnt change much. As seen below, tree sap may cover an organism. With time, the sap hardens. It turns to into amber. The original organism is preserved. This is very exciting for scientists. They are able to study the DNA of the organism that no longer lives on Earth. Some animals have been found frozen in ice. Others have been found in tar pits after falling in. Molds and casts are another way organisms can be fossilized. Have you ever walked in soft mud and left footprints? Once in a while, these traces of organisms can be preserved. In this case, nothing is left of the organism. A mold is an imprint of an organism that is preserved in rock. The organisms remains break down completely. There is nothing left of the original plant and animal.

Question: "When tree sap covers an organism and hardens, what does it become?"

Answer: "Amber"
Answer:
yes