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Bird migration routes have been studied by a variety of techniques including the oldest, marking. Swans have been marked with a nick on the beak since about 1560 in England. Scientific ringing was pioneered by Hans Christian Cornelius Mortensen in 1899. Other techniques include radar and satellite tracking.
What are other forms of studying migration?
A: radar and satellite tracking

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Fifty-year-old Baena, of Guatemalan origin, was employed by the family for 20 years and retired in January 2011. The pregnant Baena was working in the home while Shriver was pregnant with the youngest of the couple’s four children. Baena's son with Schwarzenegger, Joseph, was born on October 2, 1997; Shriver gave birth to Christopher on September 27, 1997. Schwarzenegger says it took seven or eight years before he found out that he had fathered a child with his housekeeper. It wasn't until the boy "started looking like me, that's when I kind of got it. I put things together," the action star and former California governor, told 60 Minutes. Schwarzenegger has taken financial responsibility for the child "from the start and continued to provide support." KNX 1070 radio reported that in 2010 he bought a new four-bedroom house, with a pool, for Baena and their son in Bakersfield, about 112 miles (180 km) north of Los Angeles. Baena separated from her husband, Rogelio, in 1997, a few months after Joseph's birth, and filed for divorce in 2008. Baena's ex-husband says that the child's birth certificate was falsified and that he plans to sue Schwarzenegger for engaging in conspiracy to falsify a public document, a serious crime in California.
Schwarzenegger bought Baena and their son a four-bedroom house in what year?
A: 2010

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The lifestyle of an adolescent in a given culture is profoundly shaped by the roles and responsibilities he or she is expected to assume. The extent to which an adolescent is expected to share family responsibilities is one large determining factor in normative adolescent behavior. For instance, adolescents in certain cultures are expected to contribute significantly to household chores and responsibilities. Household chores are frequently divided into self-care tasks and family-care tasks. However, specific household responsibilities for adolescents may vary by culture, family type, and adolescent age. Some research has shown that adolescent participation in family work and routines has a positive influence on the development of an adolescent's feelings of self-worth, care, and concern for others.
Does adolescent participation in family work and routines have a positive or negative influence on feelings of self-worth, care, and concern for others?
A: positive

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After the preamble comes numbered articles, which contain the substance of the parties' actual agreement. Each article heading usually encompasses a paragraph. A long treaty may further group articles under chapter headings.
What does each article heading usually encompass?
A:
a paragraph