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Insects are the only invertebrates to have developed active flight capability, and this has played an important role in their success.:186 Their muscles are able to contract multiple times for each single nerve impulse, allowing the wings to beat faster than would ordinarily be possible. Having their muscles attached to their exoskeletons is more efficient and allows more muscle connections; crustaceans also use the same method, though all spiders use hydraulic pressure to extend their legs, a system inherited from their pre-arthropod ancestors. Unlike insects, though, most aquatic crustaceans are biomineralized with calcium carbonate extracted from the water.
Active flight ability has played what kind of role for insects?
A: important

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The first time "affirmative action" is used by the federal government concerning race is in President John F. Kennedy's Executive Order 10925, which was chaired by Vice President Johnson. At Johnson's inaugural ball in Texas, he met with a young black lawyer, Hobart Taylor Jr., and gave him the task to co-author the executive order. He wanted a phrase that "gave a sense of positivity to performance under the order." He was torn between the words "positive action" and "affirmative action," and selected the later due to its alliterative quality. The term "active recruitment" started to be used as well. This order, albeit heavily worked up as a significant piece of legislation, in reality carried little actual power. The scope was limited to a couple hundred defense contractors, leaving nearly $7.5 billion in federal grants and loans unsupervised.:60
Which Executive Order first contained the phrase "affirmative action"?
A: Executive Order 10925

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Historically, the name Armenian has come to internationally designate this group of people. It was first used by neighbouring countries of ancient Armenia. The earliest attestations of the exonym Armenia date around the 6th century BC. In his trilingual Behistun Inscription dated to 517 BC, Darius I the Great of Persia refers to Urashtu (in Babylonian) as Armina (in Old Persian; Armina ( ) and Harminuya (in Elamite). In Greek, "Armenians" is attested from about the same time, perhaps the earliest reference being a fragment attributed to Hecataeus of Miletus (476 BC). Xenophon, a Greek general serving in some of the Persian expeditions, describes many aspects of Armenian village life and hospitality in around 401 BC. He relates that the people spoke a language that to his ear sounded like the language of the Persians.
What did Xenophon say Armenian language sounded like?
A: Persians

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In Canada, the term "football" may refer to Canadian football and American football collectively, or to either sport specifically, depending on context. The two sports have shared origins and are closely related but have significant differences. In particular, Canadian football has 12 players on the field per team rather than 11; the field is roughly 10 yards wider, and 10 yards longer between end-zones that are themselves 10 yards deeper; and a team has only three downs to gain 10 yards, which results in less offensive rushing than in the American game. In the Canadian game all players on the defending team, when a down begins, must be at least 1 yard from the line of scrimmage. (The American game has a similar "neutral zone" but it is only the length of the football.)
How far away from the line of scrimmage must Canadian football defenders be?
A:
1 yard