instruction:
This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.
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Passage: In military affairs, the use of infantry with specialised roles increased. Along with the still-dominant heavy cavalry, armies often included mounted and infantry crossbowmen, as well as sappers and engineers. Crossbows, which had been known in Late Antiquity, increased in use partly because of the increase in siege warfare in the 10th and 11th centuries.[AB] The increasing use of crossbows during the 12th and 13th centuries led to the use of closed-face helmets, heavy body armour, as well as horse armour. Gunpowder was known in Europe by the mid-13th century with a recorded use in European warfare by the English against the Scots in 1304, although it was merely used as an explosive and not as a weapon. Cannon were being used for sieges in the 1320s, and hand-held guns were in use by the 1360s. Question: What led to the increased use of armor in the 12th century?
answer:
The increasing use of crossbows

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Passage: Israel, and The US Air Force, in conjunction with the members of NATO, has developed significant tactics for air defence suppression. Dedicated weapons such as anti-radiation missiles and advanced electronics intelligence and electronic countermeasures platforms seek to suppress or negate the effectiveness of an opposing air-defence system. It is an arms race; as better jamming, countermeasures and anti-radiation weapons are developed, so are better SAM systems with ECCM capabilities and the ability to shoot down anti-radiation missiles and other munitions aimed at them or the targets they are defending. Question: As better weapons are created, what systems continue to improve as well to counter them?
answer:
SAM systems with ECCM capabilities

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Passage: Ronald Inden writes that by the 8th century CE symbols of Hindu gods "replaced the Buddha at the imperial centre and pinnacle of the cosmo-political system, the image or symbol of the Hindu god comes to be housed in a monumental temple and given increasingly elaborate imperial-style puja worship". Although Buddhism did not disappear from India for several centuries after the eighth, royal proclivities for the cults of Vishnu and Shiva weakened Buddhism's position within the sociopolitical context and helped make possible its decline. Question: What cults weakened Buddhism in India?
answer:
Vishnu and Shiva